Expecting stocks to tumble? Don't cash out and try to buy the dip, Burt Malkiel says.

Expecting stocks to tumble? Don't cash out and try to buy the dip, Burt Malkiel says.

Burton Malkiel is an author, economist, and Wealthfront's chief investor.Fairfax Media via Getty Images via Getty ImagesBurt Malkiel warns investors against trying to time the market in a new letter.The author and economist advocated for long-term, passive investing in broad-based index funds.He told BI it's "invariably the wrong decision" to cash out when stocks are tumbling.As tech stocks propel the market to record highs, Wall Street legend B…