In the context of foreign exchange (FX) trading, the terms "FX top of book," "Tick Data prices," and "available price in the market" refer to different aspects of how currency prices are presented and used by traders.
Here’s a breakdown of each term:
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FX Top of Book:
The "top of book" refers to the best available bid (buy) and ask (sell) prices for a currency pair at a given moment. These are the highest price a buyer is willing to pay and the lowest price a seller is willing to accept. The top of book is significant because it represents the most immediate trading opportunity available in the market.
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Tick Data Prices:
Tick data consists of every price change that occurs in the market, capturing the full range of executed transactions. This data includes all changes to the bid and ask prices, not just the best or top of book prices. Tick data is very granular and is used for detailed analysis of price movements, market dynamics, and for back-testing trading strategies.
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Available Price in the Market:
This refers to the prices that are currently available for executing trades, which may include multiple levels beyond the top of book. In markets with high liquidity, the available price might closely align with the top of book, but in less liquid markets, the available price to execute a larger order might be worse than the top of book due to slippage (the difference between expected price of a trade and the price at which the trade is actually executed).
Each of these data points serves different purposes for traders and analysts. Top of book is crucial for immediate trading decisions; tick data is valuable for analysing historical performance and intricate market behaviours; and the available price is essential for understanding the actual execution costs and planning trade sizes accordingly.
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