MINYANVILLE ORIGINAL The American economy has always been based in an atmosphere of fierce competition. Some of the most important moments in our history have arisen from great battles between titans of culture and industry: Apple (NASDAQ:AAPL) and Microsoft (NASDAQ:MSFT) Mantle and Maris Donald Trump and Donald Trump’s hair.   Add now to that list the next great struggle: Justin Bieber vs. the banking industry.   The Canadian pop star and general of a Twitter army is the latest celebrity to promote a prepaid debit card partnering with BillMyParents to back the Web company’s SpendSmart card. The service is ...