Archive · 5 Dec 2025
Young Investors Borrow to Invest Like the Ultra-Rich
A long time ago, two smart people wrote a book saying young investors should borrow money to buy stocks.
This is called lifecycle investing.
Back then, it was hard to do this because borrowing money was expensive.
But now, it's easier because of companies like Interactive Brokers that offer cheap loans.
A young investor named Mr. Street does this.
He borrows money in different currencies to buy stocks from all over the world.
He believes that over time, the stock market will give him more money than the interest he pays on his loans.
Lots of people are doing this now, and the total amount of money borrowed for investing has reached a record high.
But regulators are worried because if the stock market goes down, these investors could lose a lot of money quickly.
Financial economists Ian Ayres and Barry Nalebuff proposed lifecycle investing in 2009, suggesting young investors borrow to buy stocks.
Initially, implementing this strategy was difficult due to high borrowing costs and limited access to margin loans.
Today, platforms like Interactive Brokers offer low-interest margin loans, making lifecycle investing more accessible.
A young investor, Mr. Street, borrows money in multiple currencies to invest in both domestic and international stock indices.
Margin debt has reached a record high of $1.1 trillion in August 2024, raising concerns among regulators about potential market risks.
- Who
- Young investors, financial economists Ian Ayres and Barry Nalebuff, regulators
- What
- Young investors borrowing money to invest in stocks, a strategy called lifecycle investing
- When
- The strategy was proposed in 2009, and is now more accessible due to technological advancements
- Where
- Primarily in the United States, with access to international stock markets
- Why
- To potentially achieve higher returns by leveraging investments, following a strategy that historically showed better outcomes
- Book Authors
- Ian Ayres and Barry Nalebuff
- Book Publication Year
- 2009
- Investment Strategy
- Lifecycle investing
- Broker Example
- Interactive Brokers
- Investor's Average Interest Rate
- 3.5%
- Investor's Loan-to-Value Ratio
- 50-65%