Key TakeawaysThe S&P 500 gained 0.5% on Friday, Aug. 9, 2024, closing out a week of dramatic stock market fluctuations driven by concerns about the U.S. economy.Expedia shares jumped as international demand helped the travel platform operator top second-quarter sales and profit forecasts.Insulet shares dropped after the insulin pump maker suggested new user growth could be lower than previously expected in the second half of 2024. The S&P 500 and the Nasdaq added around 0.5% on Friday, wrapping up a volatil ...