Investing.com - JPMorgan Chase (NYSE:JPM) has some classic advice for investors: buy the dip because a rally lies ahead.In a note to clients, the Wall Street firm said investors have over-reacted to what it calls a series of "negative narratives"-- an inflation scare, a hawkish Fed, rising bond yields and rising budget deficits.JPMorgan thinks the market is bound to rise on strong fundamentals and positive forces such as the tax cut package. The firm reiterated its 12-month, stock-price target of 3,000 for the S&P 500.The bull market in stocks, which turned 9 years old in March, just suffered its second 10% correction in less than two months.Another Wall Street firm, Stifel, recently warned investors that a bear market will hit in the next year.