Why Some People Become Rich, But Most Don’t

What It Covers

Brian Preston and Bo Hanson compare two financial archetypes — Average Allen and Manny the Mutant — across four decisions: savings rate, car buying, home purchasing, and when to start investing, using median U.S. income of $83,730 to demonstrate how small behavioral differences compound into multi-million dollar wealth gaps.

Key Questions Answered

• •Savings Rate Gap: The average American saves 4.6% of gross income versus the recommended 25%, producing a $736,000 versus $4,000,000 retirement portfolio starting at age 30 on identical $83,730 incomes. Those who cannot reach 25% immediately should increase by 1% annually and redirect 60% of every pay raise toward savings and investments.
• •23/8 Car Buying Rule: When financing a vehicle, put 20% down, limit the loan term to 36 months maximum, and keep the monthly payment below 8% of gross monthly income. The average American finances $43,759 over 69 months at $772/month — double the recommended term — consuming wealth that compounds to nearly $700,000 over 30 years.
• •3/5/25 Home Buying Rule: First-time buyers can put 3–5% down but must plan to stay at least five years and keep total mortgage payments under 25% of gross income. The average American allocates 33% to housing, an 8% excess that, invested instead at $700/month over 30 years, generates roughly $1,100,000 in additional portfolio assets.
• •Wealth Multiplier and Starting Age: Every dollar invested at age 20 carries an 88x multiplier by retirement. Waiting until age 30 drops that multiplier to 23x — a fourfold reduction. Waiting until 40 reduces it to 7x. Starting at 20 with just 10% and increasing 1% annually until reaching 25% at 35 produces nearly $3,000,000 more than starting at 30 with 25%.
• •Time Advantage Cannot Be Bought Back: A saver who starts at age 30 at 25% savings rate accumulates $4,300,000 by 65. Someone who starts at 20 with a gradual ramp to 25% reaches $7,300,000. To close that gap starting at 30, a person would need to save 42% of income — demonstrating that earlier, smaller contributions outperform later, larger ones.