An underlying instrument is the financial asset—such as a stock, index, commodity, currency, or interest rate—on which a derivative contract (futures, options, swaps) is based. The value of the derivative is directly derived from the price movements of this underlying asset. For example, in a Nifty 50 options contract, the Nifty 50 index is the underlying instrument. Understanding the behaviour of the underlying instrument is fundamental to derivatives trading, as factors affecting the underlying—earnings, macro data, global sentiment—directly drive the pricing and profitability of the derivative position.
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