A confounding variable is an extraneous variable that is related to your independent variable and might affect your dependent variable. In an ideal study, there will be no confounding variables.
For example, student accounts have a limit of $100 limit per day, while non-business accounts usually are limited to $500 withdrawals a day. For business accounts, the bank offers $1000 withdrawals in one day. Chase also offers customers a withdrawal limit of $1000 every 24 hours.
There are limits on how little or how much money can be sent, and how much can be transferred in a period of time. Western Union caps any online transfer coming out of the U.S. at $3,000 each. You can send more, but it will be broken up into chunks. MoneyGram caps transfers at $899.99, for a maximum of $3,000 in a 30-day period. PayPal allows transactions of up to $10,000 domestically. iKobo limits usage of a preloaded card to $500 per day.