Savings with a bank would typically continue to circulate in the loans the bank makes. Even if one were to hide money under a mattress, the effect would be very

Savings with a bank would typically continue to circulate in the loans the bank makes. Even if one were to hide money under a mattress, the effect would be very, very slightly anti-inflationary (by withdrawing currency from the market), which anyone else with savings, or just cash, would appreciate.