Can you reconsider the stock limit? I'm not very fond of that, maybe using something like BigInteger or long type instead or increasing the limit to 100K, I don't know the context and the details so maybe you already considered this alternatives
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Stocks represent ownership of a company. You can't own 200% of a company. And most companies don't allow outsiders to own a majority. So buying 200,000,000 stocks in one company doesn't make any sense, a Limit makes sense. Maybe there should be more stock options. Having only 4 Companies to invest in is really limiting.