Recently, I’ve been looking into some investment-related topics and found that many people don’t really have a clear understanding of the concept of investment return rate. I’ll organize my understanding here in hopes of helping everyone.

The investment return rate, simply called ROI, is used to measure how much profit you’ve made from your invested money. The calculation is pretty straightforward: net profit divided by the invested capital, then multiplied by 100%. For example, if you buy stocks with 1 million yuan and later sell them for 1.3 million yuan, the ROI is 30%. It sounds simple, but in practice, you'll find that the composition of costs and income is much more complex than it seems.

Let me give an example with stock investing. Suppose you buy 1,000 shares at $10 each, and after a year, you sell them at $12.5 each, receiving $500 in dividends during the period, with a trading fee of $125. To calculate the investment return rate, you need to add up all income (stock sale + dividends), then subtract all costs (purchase price + fees). The final ROI calculated is 28.75%.

However, in advertising and e-commerce industries, the ROI people talk about is actually a bit different. Some confuse ROI with ROAS. ROAS is the advertising investment return rate, which only considers advertising costs and sales revenue, while ROI also takes into account the product cost. For example, if the product cost is $100, selling price is $300, and you sell 10 units with $500 in advertising expenses, ROI would be 100%, but ROAS would be 600%. These two concepts are indeed easy to confuse.

Later, I also learned about the concept of annualized investment return rate, which is even more interesting. It considers the time factor, making it easier to compare investments over different periods. For example, Plan A earns 100% in 2 years, while Plan B earns 200% in 4 years. It looks like B is more profitable, but when calculating the annualized return, A’s 41.4% is actually higher than B’s 31.6%.

When it comes to how to improve the investment return rate, there are basically two directions: increase profits or reduce costs. Choosing high-dividend stocks, finding brokers with low fees—these can help. But honestly, the effect of these optimizations is limited. The most direct way is to select investment targets with high ROI. Generally speaking, cryptocurrencies and forex have the highest ROI, followed by stocks and index funds, with bonds having the lowest.

However, high ROI often comes with high risk, which is very important. I’ve seen many people focus only on the ROI number and get scared by volatility, leading to panic selling. So when choosing investments, besides looking at the return rate, you also need to consider volatility, valuation, and other indicators. For example, if a certain cryptocurrency is very volatile, you might reduce your position size and balance it with stocks.

Additionally, indicators like annualized ROI, ROA, and ROE each have their own uses. ROI measures the return on invested capital, ROA looks at total asset returns, and ROE reflects the return on shareholders’ equity. Looking at these three together can give a more comprehensive understanding of the investment situation.

Finally, I want to remind everyone that while ROI is a very useful indicator, it also has limitations. First, it doesn’t consider time—an ROI achieved over 1 year is different from one over 5 years. Second, a high ROI doesn’t necessarily mean a good investment; the risk might be higher. Also, when calculating, it’s easy to overlook costs, which can lead to an overestimation of ROI. Real estate investments often encounter this issue—mortgage interest, taxes, insurance, maintenance costs all need to be included.

In summary, ROI is a very practical metric, but it must be combined with factors like time, risk, and costs to make smarter investment decisions.