The tech-heavy Nasdaq-100 index set a new all-time high at the end of 2023. In fact, it has soared by more than 25% since late October alone. But the index appears to be taking a break, because it has traded in a sideways range over the past month and sits 3% below its best-ever level. Look even closer, and some market darlings are faring even worse. Shares of artificial intelligence (AI) giant Nvidia have tumbled by 10% over the past week. History is proof that the stock market reaches new highs given enou ...