Percentage Change is a measure of how much something has changed over time in relation to its starting value. In business, it’s often used to assess the performance of investments and compare the results of different products or markets over a given period. By understanding percentage change, you can identify trends and make decisions about how you want to allocate your resources for maximum returns. Put simply, it’s a way of measuring how successful you’ve been – or could be – when it comes to money-making!