That’s assuming deflation was the cause of that instead of simply being a symptom of the collapse of the financial system. Also, in a deflationary environment, money sitting in a savings account wouldn’t necessarily collect interest, in fact the interest rate for a savings account could even be negative. Either way, a healthy investment environment would provide much greater returns than a 2% increase in value of money sitting in an account. Consumers continuing to buy things means there are clear business opportunities.