In the stock market, the price of stock is based on the supply and demand of investors. Stock prices tend to rise when it seems like a company will earn more in the future. Investors might then buy more of the stock, raising the prices even further due to an increased demand. What Causes Economic Bubbles? - Prateek Singh, YouTube video It sounds like any company will earn more, while in fact it's the company whose stock is increasing in price. So, to you, is the use of the indefinite article correct here? Thanks.