Nio (NYSE: NIO) stock fired up this week -- and how. Barring one down day, the shares rallied every other day and were up a whopping 28% through the week as of 11:45 a.m. ET Friday, according to data provided by S&P Global Market Intelligence.

Nio is growing rapidly, as its latest delivery numbers suggest, but this week's epic rally was driven almost entirely by one macroeconomic trigger. That one trigger alone attracted big investors into Nio, as they perhaps see it as a surefire sign of an end to the biggest overhang on the electric vehicle (EV) stock.

For that matter, Nio's CEO William Li also had some big things to say this week, including his belief that Nio will give German luxury carmaker BMW a run for its money.

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Source Fool.com