The fact that you want to invest a minimum amount tells us something about your risk profile.
But the question is wrong. You can invest a small amount or a big amount in a bad company stock. The key is to select a good company that has a strong reputation, good cash flows, profitability and good return on equity.
You can also invest via equity mutual funds where a professional fund manager can make these decisions on your behalf. You can start with as little as Rs 500 to get exposure to the equity space.
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