Golden Finance reported that according to the US World News on April 5, Musk, a billionaire who served as head of the government's efficiency department, rarely publicly criticized people in the Trump administration's core circle when the tariff war caused a plunge in Wall Street stock market. Peter Navarro, a senior adviser to Trump's trade and manufacturing industry, tried to downplay market concerns caused by losses caused by tariff wars in the past two days on CNN on the 4th. Musk publicly mocked Navarro on his social platform X after Navarro insisted that tariffs would eventually win a good result. He responded to a post that mentioned that Navarro had a PhD in economics at Harvard University, saying: "Having a PhD in economics at Harvard is not a good thing, but a bad thing. It leads to conceit or a problem with his brain." One user responded that Navarro was "correct", while Musk replied: He "has nothing achieved." (Everything)