Debunking Economics - the podcast Compound Growth in a Finite World
Mar 24, 2026
A lively discussion of how compound interest ties to exponential growth and physical resource limits. They trace historical bans on usury and why attitudes shifted after fossil-fuel driven growth. Banking mechanics and money creation are explained alongside why financial returns can outpace real economy returns. The conversation warns how climate and energy decline could end perpetual growth.
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How Small Interest Rates Produce Big Exponential Changes
- Compound interest creates exponential money growth that people often miss when they see steady percent growth headlines.
- Steve Keen illustrates with 5% over 10 years turning $100 into $163 to show how surprising modest rates compound over time.
Why Borrowers Don't Always Need To Reborrow Interest
- The common claim that borrowers must endlessly re-borrow to pay interest is a fallacy when loans fund productive investment.
- Keen uses a Big Bob's Bagel Bin example where profit covers $5 interest and generates $35 owner profit, keeping principal constant.
Banks Create Money Not Lend Deposits
- Banks create money via double-entry bookkeeping rather than lending out deposited cash, so their cost basis is the bank's operating capital not the full loans they issue.
- Keen notes banks' capital might be $1bn but they create far more loans, producing returns far above typical business returns on physical capital.