The Atlanta Fed has a spreadsheet model that tries to forecast the U.S. GDP growth rate in real time. Right now, it is showing a sudden, sharp contraction. When I see something like this in any model, I first check the math to see if something got broken. Second, I check the input data for anything missing or otherwise weird. Assuming the Atlanta Fed has a functioning procedure for these checks before it makes its results public, here are some other possible explanations.
First would be the sudden contraction in government spending and general economic anxiety caused by the amateur economic policy the current U.S. administration is implementing. But it’s hard to believe this would be so sudden, and if it were true you might expect to see it in the stock market. The stock market is in fact down about 5% over the last month, which is a lot, but not the kind of discontinuous collapse shown by the Atlanta Fed.
J.W. Mason, and economics professor, suggests it may be caused by a sudden surge of imports as companies try to beat the clock before tariffs hit. Net imports get subtracted from GDP, which I guess makes sense because they represent a flow of money out of the country in exchange for goods and services produced in other countries. He explains though that this could just mean the goods are stockpiled in warehouses to be distributed over the next few months, in which case GDP growth should just bounce back to trend.
There is another theory involving gold. This is the same source (Mason) quoting a report by Goldman Sachs.
most of the widening in the trade deficit since November has been driven by higher gold imports … as participants in the gold market sought to insure themselves against potential tariffs on gold. Although this may seem like a frontloading effect ahead of potential tariffs, these imports are for the most part … being shipped to the US on the off-chance that physical delivery of the gold is required,… Importantly, the Bureau of Economic Analysis (BEA) excludes most gold imports when calculating the imports component of GDP. ….
The same reasoning applies more generally to front-loading by retailers, wholesalers, and producers ahead of tariff increases. Because these developments are unrelated to US production, they should have little net effect on US GDP. In the case of non-gold goods, higher imports should be offset by higher inventories in the national accounts. In practice, it is possible that front-loading exerts a modest drag on reported GDP because imports… tend to be measured more accurately than inventories. We suspect this dynamic is playing out now to some extent… But because front-loading these imports now implies fewer imports later, we think the net effect on 2025 GDP growth should be small.
This is largely over my head, but again it suggests some short-term accounting effect rather than something going on in the real economy that would have an imminent impact on employment and prices.