The long-awaited moment has arrived. The Federal Reserve is meeting this week, and economists are predicting policymakers will launch the first interest rate cut in four years. The Fed began lifting rates back in 2022 to calm raging inflation and since has lifted the benchmark rate 11 times, leaving it at 5.5% today. That's the highest level in more than 20 years.

These moves have done their job, with inflation dropping over this period. Right now, it's at 2.5% and nearing the Fed's goal of 2%. Why that level? Because it "is most consistent with the Federal Reserve's mandate for maximum employment and price stability," according to the Federal Open Markets Committee.

So economists and traders have been speculating that on Wednesday the Fed will lower the benchmark rate by at least 25 basis points, and some even predict a 50 basis point cut. As an investor in the stock market, you may be wondering what the market will do following the Fed's move. Let's look to history for some clues.

Why is a rate cut such a big deal for stocks?

First, let's consider why a rate cut is such a big deal for the stock market in general and for investors in particular. Higher rates can hurt corporate earnings and investor appetite for stocks due to a couple of factors. As the fed funds rate goes up, so do other borrowing costs for individuals and companies.

For example, high-growth companies relying on loans to build their businesses will see these expenses climb. As a result, potential investors may worry about their ability to fund growth and may stay away from these sorts of stocks. As for individuals, higher borrowing costs eat into their budgets, and that means they probably won't have as much discretionary income to spend.

Investors, seeing this unfold, often lose confidence in stocks most vulnerable in this sort of environment. They might hesitate to buy shares of those young growth companies — often technology players — and they may stay away from companies, such as those in entertainment or travel, that rely on discretionary spending.

Investors might even rein in their investments in the stock market as a whole and opt for investments that tend to flourish in a higher-rate environment, such as bonds.

Of course, as interest rates fall, the situation shifts, with borrowing becoming easier and cheaper for companies and individuals, while consumers find themselves with more money to spend on non-essentials. All of this paints a brighter picture for corporate earnings, and that, in turn, makes investors more confident about putting their dollars into the stock market.