Knowing the math behind percentages is essential to understanding how investments and markets function.
When it comes down to it, everyone wants to know the same thing about their investments: Are they up or down, and by how much? The gain or loss in a particular investment is almost always expressed by a percentage. If you bought a stock for $10 yesterday and today it costs $12, you're up 20%.Divide that by the initial value .Knowing how this works is essential to understanding how your investments perform.
Make the numbers bigger and you'll see how important it is to protect your portfolio from major downdrafts. A 50% loss requires a 100% return to break even.Percent change allows you to express the difference between two values, but what if the two things you want to compare are percentages? This happens all the time in finance. You may want to compare the performance of a fund to its benchmark index. Or maybe you want to express how the yield on a bond has changed.
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