Debt repayment does not contribute to economic activity. You need spending on goods and services to support the economy.
So the deadbeats are doing the right things and helping us avert a deeper recession by not paying the banks and spending on other things.
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This is not necessarily true. Consider the flip side. Some person, group of persons, pension fund or other entity or group of entities was expecting a return on their money.
If you have money in CDs for example, you might use the interest to buy stuff. If the holder of the CD stops paying, guess what, you no longer have that income to buy stuff.
Furthermore, the loan repayments not being made back to the bank result in less capital available within the banking system for providing lending for productive purposes.