In Korean stock discussions, people often ask what would happen if a stock hit its daily upper price limit several days in a row. The question is simple, but the money can change faster than the headline percentage suggests.
Korean stocks have a daily price limit. KRX describes the daily price limit as 30% above or below the base price. If a stock reaches the upper limit on a trading day, that day's return is 30%.
So what happens if $1,000 is invested in a Korean stock and it hits the upper limit for five straight trading days? The answer is not a 150% return.
If $1,000 gains 30% for five consecutive trading days, it becomes about $3,713. The total return is 271.29%, or about 3.71 times the starting money.
| Period | Final amount | Profit | Total return | Multiple |
|---|---|---|---|---|
| 1 day | $1,300.00 | $300.00 | 30.00% | 1.30x |
| 3 days | $2,197.00 | $1,197.00 | 119.70% | 2.20x |
| 5 days | $3,712.93 | $2,712.93 | 271.29% | 3.71x |
| 10 days | $13,785.85 | $12,785.85 | 1,278.58% | 13.79x |
| 20 days | $190,049.64 | $189,049.64 | 18,904.96% | 190.05x |
After one limit-up day, $1,000 becomes $1,300. That part is easy to understand. The profit is $300.
After three consecutive 30% gains, $1,000 becomes about $2,197. It is tempting to think of this as 90%, but the actual total return is 119.70%.
After five days, the amount is about $3,713. The profit is about $2,713, and the money is about 3.71 times the starting amount.
Why is it not 150%?
Five 30% gains are not calculated by adding 30% five times. On the first day, $1,000 becomes $1,300. On the second day, the 30% gain is applied to $1,300, not the original $1,000.
On the third day, the gain is applied to an even larger amount. Each day's profit becomes part of the next day's base. That is compounding.
This scenario is intentionally extreme. A stock hitting the upper price limit for many days in a row is rare, and real trading involves halts, liquidity, execution risk, fees, taxes, disclosure events, and market psychology.
The purpose of the calculation is not to predict a stock. It is to show how quickly money can change when a high daily return is repeated for several days.
A 30% daily move is already large. If that return is compounded, the result can become much larger than a simple percentage headline suggests.