Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

What can I do when the trading price of a stock or ETF I want to buy is too high?
If you find a particular stock to be overvalued at $200 for example and a reasonable value at $175, you can place a limit order at the price you want to pay. If/when the stock price falls to your desired purchase price, the transaction takes place. Your broker can explain how long a limit order can stay open. This method allows you to take advantage of flash crashes when some savvy stock trader decides to game the market. This tactic works better with more volatile or low-volume stocks. If it works for an S&P500 tracking ETF, you have bigger problems. :) Another tactic is to put money into your brokerage cash account on a regular basis and buy those expensive stocks & funds when you have accumulated enough money to do so. This money won't earn you any interest while it sits in the cash account, but it's there, ready to be deployed at a moment's notice when you have enough to purchase those expensive assets.