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The Federal Reserve cut its key interest rate this week to protect the "record-long economic expansion from slowing global growth," said Christopher Condon at Bloomberg. The quarter-point cut is a signal from the central bank that it hopes to get ahead of a potential slump. Economic growth slowed to 2.1 percent in the second quarter, falling a full basis point below the first-quarter number. Though a rate cut is what President Trump — who tweeted that the Fed "let us down" by rejecting a bigger cut — has called for, it's actually a sign that Trump's "supercharging of growth hasn't worked" as advertised, said Matthew Yglesias at Vox.com. For two years, Trump has promised to achieve a "sustainable 3 percent economic growth rate by slashing government regulations and business tax rates." That's looking like an illusion. Early estimates of 2018 growth seemed to show that Trump might have met the target in 2018, but the latest data have made the government revise the numbers downward to 2.5 percent. The economic expansion under Trump has been merely "fine" — as it was in the later part of the Obama presidency.

It's worrisome that the economy really "isn't behaving as expected," said Nick Timiraos at The Wall Street Journal. When the Fed began raising rates from near-zero after the financial crisis, economists' "models held that falling unemployment would eventually fuel rising inflation." That's not all bad; inflation can be "a sign of healthy growth across the economy." But in fact, even with interest rates still at historic lows, inflation has been well below the Fed's 2 percent target. And while relatively low unemployment should have pushed wages higher, wage growth has been lackluster. That has led Federal Reserve Chairman Jerome Powell to argue the economy is really barely above lukewarm. "To call something hot," said Powell, "you have to see some heat." In fact, whatever heat there was is disappearing, said Karl Smith at Bloomberg. Business investment fell 0.6 percent in the last quarter, compared with a 4.4 percent increase in the first three months of 2019. Exports were also down 5.2 percent, widening a trade deficit burdened by the tariff war with China. "If President Donald Trump wants to improve conditions — both in the economy and for his re-election — then he might start by ending his trade war."

Conservatives and liberals, markets and media — everybody is applauding the Fed for cutting rates, said Ruchir Sharma at The New York Times. Sen. Bernie Sanders (I-Vt.) and Rep. Alexandria Ocasio-Cortez (D-N.Y.) want to print money to pay for ambitious social programs. Trump wants the Fed to cut interest rates to restore growth to 3 and 4 percent. In the U.S. and elsewhere, central banks are "making money ever cheaper and more plentiful to try to juice growth." Despite this, the U.S. economy "has grown at half the pace" of other post–World War II recoveries. All that cheap money has done little for the real economy; it's just powered a boom in corporate borrowing and "a record bull run in the financial markets." Now the Fed's prescription is more rate cuts — setting the stage for exactly the kind of "debt-fueled market collapse" that tanked the world economy in the first place.