Should You Pay Off the Mortgage or Invest the Difference?
Prepaying a dollar of mortgage principal earns a guaranteed return equal to your mortgage rate. Investing that same dollar earns more on average and
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How the Rule of 72 Exposes the True Cost of Every Fee
A 1 percent fee sounds like a rounding error. Run it through one line of mental math and it turns a 7 percent return into a 6 percent return, which pushes
FoundationsThe Freedom Cost Matrix: What Your Car Choice Is Really Costing You in Years of Your Life
A BMW 3 Series costs $55,000 at the dealership. The real price — in the only currency that matters — is 8.6 years of your working life. Here is the derivation.
Deep diveThe S&P 500 Is Less Diversified Than Its Name Suggests
The number 500 in the S&P 500 promises a wide net. The weighting rule underneath it quietly hands most of your money to ten companies. By year-end 2025
Index InvestingThe Only Account the IRS Lets You Deduct, Grow, and Spend Tax Free
One account lets you deduct the money going in, grow it with zero tax, and pull it out tax free. The IRS built exactly one like that, and most people use
TaxesI Fact-Checked an AI's Financial Advice
An AI-generated summary told me luxury cars lose 48.1 percent of their value in five years. The number is specific, plausible, and does not exist. No
AIGolden Handcuffs: The Engineering Reason Why High-Earning Tech Workers Are Financially Fragile
A $400k salary without liquid reserves is not financial security. It is a well-funded fragility — and Nassim Taleb's framework explains exactly why.
Deep diveThe Yield Curve Has Called Nearly Every Recession Since the 1950s
One line in the bond market has flipped negative before every US recession in half a century, and it has never once told anyone the date. That line is the
MarketsIs the 60/40 Portfolio Dead? A Century of Data Answers
In 2022 the 60/40 portfolio lost about 17 percent as stocks and bonds fell together, and a wave of headlines declared the strategy dead. The obituary was
Asset AllocationThe $23,250 Freedom Tax: How Your Commute Is Quietly Bankrupting Engineers
Most engineers calculate their compensation correctly and their commute cost completely wrong. Here is the full derivation — to the dollar.
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