A bull market, or bull run, is defined as a period of time where the majority of investors are buying, demand outweighs supply, market confidence is at a high, and prices are rising. If, in a given market, you see prices quickly trending upwards, this could be a sign that the majority of investors are becoming optimistic or “bullish” about the price increasing further, and may mean that you’re looking at the start of a bull market. Investors who believe that prices will increase over time are known as “bulls.” As investor confidence rises, a positive feedback loop emerges, which tends to draw in further investment, causing prices to continue to rise.