Time Spread Explained

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Why Time Is Relative, Explained in Under 3 Minutes

One of the most revolutionary concepts that we learned in the 20th century is that time is not a universal measurement.

It doesn’t matter how much our lives are governed by the same seconds, minutes, hours, days, and weeks, regardless of where we live on the globe, time will never be absolute. The rate at which it passes depends entirely on your speed and acceleration at any given moment.

But how exactly can time be slower and faster at the same time?

As the latest episode of MinutePhysics explains, the rate at which time passes actually slows down the more you’re moving.

And I’m not talking about your perception of time, which recent research suggests is actually speeding up, thanks to the over-abundance of technology in our lives. I’m talking about the rate of actual time, shown in numerous experiments to slow down when particles such as muons and photons speed up.

In Einstein’s theory of relativity, time dilation describes a difference of elapsed time between two events, as measured by observers that are either moving relative to each other, or differently, depending on their proximity to a gravitational mass. Basically, it states that the faster we go, the more the time is affected.

But if time is as relative as this suggests, it can seem a little contradictory.

As Henry from MinutePhysics points out, imagine if the two of us are zooming through the emptiness of space in opposite directions, and then suddenly pass by each other.

“From my perspective it seems like you’re moving, and so time should go more slowly for you, but from your perspective, it seems like I’m moving, so it should go more slowly for me,” he says.

So how can we both think time is going more slowly for the other person? Someone’s time must actually be slower, right?

Well, no, sorry. We wish it were that simple.

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The explanation has to do with how you rotate the direction of time itself every time you change speeds. Yep, you rotate time every day like it’s nbd, so congrats.

Check out the video above to get the quickest, most awesome explainer for the weirdness of time dilation, and stick around until the end to get a neat little brain-teaser that could tie even the best of us in knots. Enjoy.

What is a currency spread on the Forex market?

On the Forex market, just like on any financial market, transaction costs are charged whenever you open a new position. In Forex, this transaction cost is called the “spread” and represents the difference between the Bid and Ask prices of a currency pair. However, to understand how Forex brokers derive their spreads and what Bid and Ask prices are, you first need to understand how currency pairs are quoted in Forex.

Introduction to Forex spreads

On the Forex market, currencies are always traded in pairs. A currency pair consists of the base currency (the left-hand side of the pair) and the counter, or quote currency (the right-hand side of the pair). The quote of a currency pair tells us how many units of the counter currency it is possible to buy with one unit of the base currency.

Let’s explain this further by looking at a typical example of a Forex pair.

The EUR/USD pair is trading at 1.1845. In this example, the euro (EUR) is referred to as the base currency, and the US dollar (USD) as the counter or quote currency. What this rate tells us is that the US dollar is trading at 1.1845 USD for 1 euro. Simply put, buying 1 euro will cost us 1.1845 USD.

To give another example, let’s take a look at the USD/JPY pair, which is trading at 108.50. Now, the US dollar is the base currency and the Japanese yen the counter or quote currency. If this pair is trading at 108.50, it simply means that 1 USD can buy 108.50 Japanese yen at the moment; or to put it another way, buying 1 USD will cost us 108.50 Japanese yen.

Forex traders try to anticipate the future price movements of currency pairs in order to make a profit. If a trader thinks that the rate will go up, they will buy the pair. And if they think the rate will fall, they will sell the pair. A rise in the currency rate means that the base currency is appreciating (rising in value), and the counter currency is depreciating (falling in value). If the EUR/USD pair from our example rose to 1.1890, we would have to pay a higher price in dollar terms for one euro (i.e. the euro buys more US dollars than before), which tells us that the euro has appreciated against the US dollar.

How currency spreads are calculated

Now that we know how currency pairs are quoted against each other, let’s move on to Forex spreads. There are always two rates available for a given currency pair; the Bid rate and the Ask rate. Depending on whether you’re buying or selling the base currency, you’ll have to pay a different rate. The Bid rate is the rate at which your broker is willing to buy the base currency from you, and the Ask rate is the rate at which they’re willing to sell the base currency to you.

The difference between the Bid and Ask rates is called the “spread”, and represents your broker’s profit. As in all markets, the broker tries to buy the base currency at a lower price (Bid rate), and sell it later for a higher price (Ask rate). That’s why the Ask rate is higher than the Bid rate.

Let’s take the EUR/USD pair from our first example again and expand it to include the Bid/Ask information. The following table expands on our previous example with the Bid and Ask prices for the EUR/USD pair.

The EUR/USD rate of 1.1845 represents the Bid rate, i.e. the price in dollar terms at which the broker is willing to buy 1 euro from you. The Ask rate of 1.1847 is the rate at which the broker is willing to sell 1 euro to you. This represents a spread of 2 pips. Whenever you open a position, you will eventually have to close the position at some time in the future, paying the spread to your broker.

The cost of the spread depends on the size of the position you intend to open. While the pip value of a 1k position size is approximately 0.1 USD, the pip value of a standard lot (100k) position is closer to 10 USD. Opening a 10k position on EUR/USD with a 1 USD pip value would incur a 2 USD spread cost on the transaction.

Still, Forex has one of the lowest transaction costs compared to all other major financial markets. The cost of opening a position (transaction cost) on the Forex market is usually only the spread that your broker charges, which can be as low as 1 pip on the most-traded majors, such as EUR/USD or GBP/USD. On the other hand, cross currencies that don’t involve the US dollar, such as GBP/JPY, as well as exotic and less liquid currencies, can have significantly larger spreads. That’s why traders need to take Forex spreads into account when building their trading strategy.

Types of Forex spreads

There are a number of different types of spreads that are used on the Forex market. The following types are the most common:

  1. Fixed spreads – These spreads are constant and don’t depend on market conditions.
  2. Fixed spreads with an extension – These spreads contain a fixed part, and a variable part which may be adjusted by the broker according to current market conditions.
  3. Variable spreads – Variable spreads fully represent the current market condition and the pair’s liquidity. Under normal market conditions, variable spreads can be very tight (as low as 1 pip on major pairs), but with increased market uncertainty and during major news releases, those spreads can go as high as 40 – 50 pips.

Factors that influence the spread in Forex trading

Forex spreads are variable and depend on various factors; including market liquidity, market conditions, upcoming economic data and investor sentiment. During times of important market reports, such as reports on economic growth, inflationary reports or interest rate changes, the spread usually widens. Simply said, whenever there is an imbalance of buyers and sellers for a specific currency pair, the spread will widen to reflect this market condition.

As a trader, you naturally want to minimise the cost of your transaction, and you can do this by following these few rules:

  1. Avoid trading exotic currency pairs. It’s better to stay with the majors. All majors have very tight spreads as brokers and market makers compete against each other to increase their market share. This is beneficial for traders as they will pay lower transaction costs with tighter spreads. On the other hand, less popular currency pairs with lower competition and liquidity will have significantly higher spreads.
  1. Trade only during the most active hours on the Forex market. As the number of market participants increases, spreads usually narrow as there are many buyers and sellers for any given price of a currency pair. The most active part of the day on the Forex market is the overlap of the New York and London sessions, between 12:00 PM and 4:00 PM GMT. This is also the time when the largest price fluctuations take place.
  1. Avoid trading during major news releases. The Forex market is full of excitement and there is a major news release for at least one of the eight major currencies nearly every day. Traders and large investors tend to stay away from the market until the release has been published, as this is usually accompanied with large price movements and an imbalance between buyers and sellers, which widens the spread.
  1. Gaps and wide spreads often come together. If there’s an important market event over the weekend, the price will tend to open with a gap lower or higher than the market closed on the previous Friday. When such a gap forms with the opening of the Sydney session, spreads are often very wide, and can reach dozens of pips even on major currency pairs such as EUR/USD. After the session and trading week gain momentum, the spread also narrows. As such you should avoid trading immediately after a gap forms if transaction costs are very important to your trading strategy.


This article explained why taking care with transaction costs on the Forex market is an important milestone to becoming a profitable trader. Knowing the best times when to trade the market, and how to avoid extremely high spreads, can make a significant difference in the bottom line for every trader. This is especially true for day traders or scalpers who tend to open many trades in a short period of time, where transaction costs incurred by spreads can represent a significant chunk of their profit. The most important note to remember is that during increased market uncertainty and major news releases, spreads can skyrocket even on major currency pairs. On the other hand, trading exotic currency pairs will always incur increased transaction costs compared to the majors, and you should avoid these pairs altogether unless you have a specific (and profitable) trading strategy for trading the minors.

Zika’s Rapid Spread Explained in 3 GIFs

T he Zika virus has spread rapidly through the Americas, sparking alarm over the possible link between the virus and the birth defect microcephaly. Though the disease causes minor symptoms for most people who are infected, the potential consequences for pregnant women and their unborn children have prompted travel warnings from health officials. But how precisely do mosquitoes spread Zika so quickly, and how many people can they infect? We broke it down for you:

Mosquitoes pick up Zika from infected people

The Aedes aegypti mosquito is the type that’s currently spreading Zika. The females are the ones that actually bite, since they need the blood to lay their eggs. What makes mosquitoes such good vectors for disease is the fact that they ingest microbes directly from a person’s blood and then pass them directly into the bloodstream of another person—a bit like a flying hypodermic needle.

Infected mosquitoes spread Zika to healthy people

Once a female Aedes aegypti mosquito is infected with Zika, researchers believe that she remains infected and able to pass on Zika for the rest of her life, which is usually about two to four weeks. The mosquito will take three or four blood meals in all during her lifetime, and during each of those blood meals, she typically bites four to five people. Unlike some mosquitoes that bite during the night, the aegypti bite during the daytime and, according to the World Health Organization (WHO), they have a “remarkable ability” to adapt to different environments.

Zika spreads quickly and is tough to track

It’s difficult to get an accurate estimate of the total number of people infected with Zika, since 4 out of 5 people infected will not exhibit any symptoms of the disease. Rapid testing methods are also hard to come by. Brazil has put a tentative estimate of the number of people infected with Zika in the country at 1.5 million, and 3 to 4 million additional infections are expected in the Americas over the next year. The virus typically remains in the body of an infected person for about a week and can be spread to additional mosquitoes during that time. Mosquitoes are actively transmitting Zika in 30 countries, according to the WHO.

Call Ratio Spread Explained

What is Call Ratio Spread?

The Call Ratio Spread is a premium neutral strategy that involves buying options at lower strikes and selling higher number of options at higher strikes of the same underlying stock.

When to initiate the Call Ratio Spread

The Call Ratio Spread is used when an option trader thinks that the underlying asset will rise moderately in the near term only up to the sold strikes. This strategy is basically used to reduce the upfront costs of premium paid and in some cases upfront credit can also be received .

How to construct the Call Ratio Spread?

Buy 1 ITM/ATM Call

Sell 2 OTM Call

The Call Ratio Spread is implemented by buying one In-the – Money (ITM) or At-the-Money (ATM) call option and simultaneously selling two Out-the-Money (OTM) call options of the same underlying asset with the same expiry. Strike price can be customized as per the convenience of the trader.


Call Ratio Spread

Market Outlook

Moderately bullish with less volatility

Upper Breakeven

Difference between long and short strikes + short call strikes +/- premium received or paid

Lower Breakeven

Strike price of long call +/- Net premium paid or received



Limited (when Underlying price = strike price of short call)

Margin required

Let’s try to understand with an Example:

NIFTY Current market Price

Buy ATM Call (Strike Price)

Premium Paid (per share)

Sell OTM Call (Strike Price)

Net Premium Paid/Received

Suppose Nifty is trading at Rs 9300 . If Mr. A believes that price will rise to Rs 9400 on expiry , then he enters Call Ratio Spread by buying one lot of 9300 call strike price at Rs 140 and simultaneously selling two lot of 9400 call strike price at Rs 70. The net premium paid/received to initiate this trade is zero. Maximum profit from the above example would be Rs 7500 (100*75). For this strategy to succeed the underlying asset has to expire at 9400. In this case short call option strikes will expire worthless and 9300 strike will have some intrinsic value in it. However, maximum loss would be unlimited if it breaches breakeven point on upside.

For the ease of understanding , we did not take in to account commission charges . Following is the payoff schedule assuming different scenarios of expiry.

The Payoff Schedule:

On Expiry NIFTY closes at

Net Payoff from 9300 Call Bought (Rs)

Net Payoff from 9400 Call Sold (Rs) (2Lots)

Net Payoff (Rs)

The Payoff Graph:

Impact of Options Greeks:

Delta: If the net premium is received from the Call Ratio Spread, then the Delta would be negative, which means slight upside movement will result into loss and downside movement will result into profit.

If the net premium is paid then the Delta would be positive which means any downside movement will result into premium loss, whereas a big upside movement is required to incur loss.

Vega: The Call Ratio Spread has a negative Vega. An increase in implied volatility will have a negative impact .

Theta: With the passage of time, Theta will have a positive impact on the strategy because option premium will erode as the expiration dates draws nearer.

Gamma: The Call Ratio Spread has short Gamma position, which means any major upside movement will impact the profitability of the strategy.

How to manage risk?

The Call Ratio Spread is exposed to unlimited risk if underlying asset breaks higher breakeven; hence one should follow strict stop loss to limit loses.

Analysis of Call Ratio Spread:

The Call Ratio Spread is best to use when an investor is moderately bullish because investor will make maximum profit only when stock price expires at higher (sold) strike. Although investor profits will be limited if the price does not rise higher than expected sold strike .

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