Market indicators became more pessimistic.Carnival Corp. (CCL 0.97%) stock dropped 11% in July, according to data provided by S&P Global Market Intelligence. It was negatively affected by overall macroeconomic events and investor sentiment, but there wasn't any news specific to the cruise industry leader.Demonstrating why it's a leaderCarnival was a reliable market-beating stock before the pandemic, with steady increases in revenue and profits over many years. It also paid a growing dividend.That all change ...