Fixed investment, also known as "fixed investment on a regular basis", as the name implies, is to automatically purchase the specified products in batches at a fixed time and amount. Because it saves time and effort, many a mickle makes a mickle, and there is no need to choose the right time, it is called a financial management method for lazy people. Buying is a one-time purchase, that is, you buy all the money you can control at the same time.