It is the worst year for buying the stock-market dip since the 1930s.
Instead of rebounding after a tumble, stocks have continued to fall, burning investors who stepped in to buy shares on sale. The S&P 500 has dropped 1.2% on average this year in the week after a one-day loss of at least 1%, according to Dow Jones Market Data. That is the biggest such decline since 1931.
Source: https://www.wsj.com/articles/buying-the-stock-market-dip-is-backfiring-this-year-11664064845?siteid=yhoof2&yptr=yahoo