Contract SizeThe contract size tells the program what is traded when you buy or sell. The default size is one, and it is easiest to leave it at one. You can change it to add more realism to the position management exercise.
Examples
Stock Options: typically, options are traded on a multiple number of underlying assets, such as 100 stocks or 500 times an index value, but the quote is on a single option. If you set the contract size to 100 and you trade 1 unit of the security, the program will conduct the trade for 100 securities.
Bonds: The default face value of a bond is 100. Most bond prices are quoted on the basis of this face value. If the actual face value is, say, 1 million, then you should set the contract size to 1,000,000/100 = 10,000. This will ensure that you trade a bond with a face value equal to 1 million