Investing basics: growth, risk, and time
2 min read
Compounding rewards the early starter. Learn what you own, what it costs, and why time is the greatest edge a young physician has.
THE IDEA
Investing is buying assets that you expect to grow or pay you over time. Stocks are ownership in businesses — higher long-run growth, bigger swings. Bonds are loans to governments or companies — steadier, lower growth. Cash is safety that quietly loses purchasing power to inflation. Compounding — growth earning its own growth — means money invested early works harder than money invested late, which is why starting small in training beats starting big later.
Three ideas protect beginners. Diversification — owning many assets instead of a few — spreads risk you are not paid to take. Costs compound too: a fund's expense ratio is charged every year, so lower-cost diversified funds keep more of your return. And risk tolerance is not risk capacity: your stomach sets the first, but your decades-long time horizon sets the second. Never invest the emergency fund, and never borrow to invest.
Your next steps
- Write down what stocks, bonds, and cash each do in one sentence.
- Check the expense ratio on any fund you own.
- Confirm your emergency fund is separate from any invested money.
- Decide what a market drop would make you do — before it happens.
Check your understanding
Select each question to reveal the answer.
Planning questions
- What is your investing time horizon, in decades?
- What are you currently paying in fund expense ratios, if anything?