How's that Trump tax cut working out?

SO far, Donald Trump and his allies in Congress have achieved one and only one major legislative victory: Passing a large tax cut, mainly aimed at corporations and business owners. The tax cut's proponents promised that it would lead to a dramatic acceleration of economic growth and produce big gains in wages; they hoped that it would also yield big political dividends for the mid-term elections.

So how's it going? Politically, the tax cut is a damp squib: Most voters say they haven't seen any boost to their paycheques, and Republicans are barely talking about the law in their political campaigns. But what about the economics?

You might be tempted to say that it's too early to tell. After all, the law has been in effect for only a few months, and we got our first look at post-tax-cut economic growth only last week. But here's the thing: To deliver on its backers' promises, the tax cut would have to produce a huge surge in business investment - not in the long run, not five or 10 years from now, but more or less right away. And there's no sign that anything like that is happening.