Explain why investors trade and how the reason shapes the trading approach

The reason for a trade sets its urgency. Profit-seeking trades rest on an alpha signal that decays: fast-decaying alpha calls for quick execution, while slow alpha allows patient trading. Risk-management and hedging trades, such as cutting beta or currency exposure, usually need prompt execution to close the unwanted risk. Cash-flow trades from subscriptions, redemptions or index changes are often tied to a particular time, such as the close. Corporate actions and margin calls create forced trades, and routine rebalancing trades can often be worked patiently. The central trade-off is between market impact, which rises with speed, and execution or opportunity risk, which rises with delay. The trap is handling every order the same way regardless of why it was placed.