Final answer:
The invention of "flying cash" made trade easier by enabling Chinese merchants to use paper money instead of cumbersome copper coins.
Step-by-step explanation:
The statement is true. The invention of "flying cash" did make trade easier by enabling Chinese merchants to use paper money instead of cumbersome copper coins. This innovation was introduced during the Yuan dynasty in China and was implemented to alleviate the issues caused by heavy taxation and inflation. Paper currency allowed for greater convenience and facilitated economic transactions.