Dual Investment can give high rate of return (APY) up to 300%, which equivalent to 0.8% profit in one day. In some special cases, APY maybe even higher than that. Where does this profit come from? It comes from 2 sources as following :

Firstly, it is your promise from the buyer side. The essence of a dual investment is an option contract. There, the seller makes a contract (promise) that he will make the purchase or sale of the property at the "target" price and will receive a fee paid by the "buyer". This fee is APY.

The second is due to market volatility. The greater the "market volatility" leads to the higher the "promise" risk. Therefore, profit APY at times of strong market volatility will be higher..