It all depends on how much money you want to invest and what is the price of the stock. For example if you want to invest 500-700$ you can consider buying one share of GOOG, but you will need to buy much more shares of MSFT. You can think of diversification of your portfolio, but it doesn't make sense to look at your investment through number of shares. You have invested for example 600$, and gain 10% = 60$ - it doesn't matter how much shares you have.

And you will certainly not buy one penny stock
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