Historically, Trump's announcements have led to market fluctuations, with his optimistic tone often positively impacting stocks. Given the lack of details in this post, it's difficult to pinpoint specific industries that may be affected. However, considering Trump's past support for sectors like energy, finance, and manufacturing, these areas may experience a boost in stock prices. The tease of a 'BIG ANNOUNCEMENT' could also lead to increased market volatility as investors speculate about the nature of the announcement. Overall, the ambiguity of the post may lead to a short-term increase in stock prices, driven by speculation and anticipation, but the long-term impact will depend on the actual content of the announcement. As the post lacks specific details, the market may react cautiously, but the overall sentiment remains bullish due to Trump's history of promoting a strong economy and business-friendly policies.