There are two ways to make money in the stock market: dividends and capital gains.
Dividend yields are near all time lows, as shown in this historical graph of dividend yield of the S&P500. The dividend yield of the S&P 500 is currently (as of October 19, 2016) 2.07%, so if you want to make $50K per year off of stock market dividends you'll need a portfolio of about $2.4 million.
And then you also have to worry about the value of your stocks declining precipitously. Several times in my investing lifetime the S&P 500 has declined over 33%, and many stocks have gone completely belly up. If you're planning to retire on your stock portfolio, I wish you the best of luck, but urge you to consider real estate instead.
The Shiller P-E ratio (also called the CAPE, or "cyclically adjusted price earnings ratio") is now at a very high level. High CAPE valuations indicate the the market is overvalued, and have been associated with impending stock market crashes. Read more about the Shiller P-E ratio here.
Real estate (if you know what you're doing) seems to me to be a lot better investment than the stock market. The stock market is like a casino. You can only win in the short term. In the long term the house always takes your money.
Matt Taylor, New Hampshire Private Lending, email@example.com