Show host Jimmy Fallon joked this week, "It's not great when the summary of Trump's first two months in office is: stocks down, measles up." President Trump doesn't deserve blame for the recent measles outbreak.

Strong economic gains in the long term are worth the short-term stock market volatility Americans experienced this week, allies of President Donald Trump tried to argue Thursday as they fanned out across cable news and a number of media outlets to spread their perspective.

Investors, traders and speculators as well as businesses and households continue to adjust to rapidly changing times.