What is to stop me just entering payments into my account so that I get lots of credits?
Since you don’t need credits to trade, there is no point in this. In any case, your credits are someone else’s debits, and they will question your false trades with them. Your balance, which is open for everyone to see, will also reveal what you are doing. There is no need to cheat in the CES because you can simply go into debit and ‘pay back’ what you have received by delivering goods and services to others at a later time.
