As a knowledgeable professor in finance, I would like to introduce you to some technical indicators that traders use to determine when to enter or exit the market. These indicators are based on mathematical calculations and can be used for any type of contract trading. Let me illustrate with three examples:

Firstly, trend lines. These are drawn on a price chart to indicate the direction of the market trend. When prices cross and fall below an up trend line, it may signal a good time to liquidate a long position or short a contract. On the other hand, if prices cross and rise above a downtrend line, it may suggest a good time to liquidate a short position or enter a long position.

The second example is moving average. This is calculated by taking the average of a certain number of past prices. When prices cross a moving average, it could be a signal to buy or sell. This indicator is popular among traders due to its simplicity.