When it comes to exiting trades, I advocate controlling my emotions by using stop loss orders pre-set below the current market price that will be triggered regardless of my emotional state.

The assignment fee for agreement-based assignment of the right to use state-owned land may not be less than the minimum price set forth by the state.

In its nature, the state-owned stocks of corporations can be viewed as options of corporations' value. So we can set the price of state-owned stocks by using the Black-Scholes formula.