Mortgage interest payments are often tax-deductible, reducing your overall tax bill. This means the 'effective' interest rate you actually pay is significantly lower than the 'nominal' rate quoted by the bank, making the debt even cheaper and investment arbitrage more profitable.

Not all debt is negative. Using leverage to acquire assets that generate returns—like real estate, inventory, or business investments—is a smart wealth-building tool. Conversely, financing depreciating lifestyle items ('flexing') creates a financial hole that's nearly impossible to escape.

A key principle of "old wealth" is using debt with an interest rate below market returns to grow money exponentially. Conversely, "new wealth" challenges traditional wisdom by recognizing that in many markets, renting and investing a down payment can yield higher returns than home ownership.

Common wisdom to rapidly pay off a mortgage is suboptimal. Due to compounding, investing extra cash—even if the return rate merely matches your mortgage interest—will generate significantly more wealth over time. One investment compounds up while the other debt amortizes down, creating a large wealth gap.

The traditional 30-year mortgage for a primary residence is a suboptimal wealth-building tool. A more effective strategy involves securing long-term, non-callable debt to purchase productive, cash-flow generating assets, rather than tying up capital in a personal home.

Paying off high-interest debt like credit cards offers a guaranteed, risk-free return that is impossible to match in public markets. Therefore, every extra dollar should go towards eliminating this debt before considering lower-return activities like investing in a diversified portfolio (est. 5% return).

Wealthy people don't avoid debt; they use it as a tool called 'leverage'. They borrow money at a low interest rate to invest in assets that generate a higher return, effectively profiting from the spread.

Economist Arthur Laffer argues that debt is merely a tool. Debt used for productive investments that generate high returns (e.g., Reagan's tax cuts to spur growth) can be beneficial. In contrast, debt used for non-productive purposes (e.g., paying people not to work) is destructive to the economy.

Patel argues it's a financial mistake to accelerate payments on cheap debt, like a sub-4% mortgage. The emotional win of being "debt-free" is outweighed by the mathematical loss. That extra cash would generate superior returns invested in the S&P 500 or even a high-yield savings account.