Has American Economic Output Been in Decline since 2022?

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This is the premise of a new paper by Peter St. Onge and EJ Antoni. I have been trying to find a deflator that can yield that US GDP in 2024Q2 is 2.5% below 2019Q1 levels. Based on their discussion in their paper, as well as a video by Dr. St. Onge, I have tried calculating a consumption deflator that is based on house prices and mortgage rates, using the Big Mac price (which Dr. St. Onge lauds in his video as an alternative to official statistics or PWT data), and fast food prices (specifically, the food away from home/limited services restaurants component of the CPI).

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Mid-October Reading on Business Cycle Indicators – NBER BCDC and Alternatives

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Industrial and manufacturing production below consensus (-0.3% m/m vs -0.1%, -0.4% vs -0.1%, respectively), while retail sales and core retail sales above consensus (+0.4% m/m vs +0.3%, +0.5% vs +0.1%, respectively). Here’s the resulting two pictures, first one for those indicators followed by the NBER BCDC, and the second one alternatives.

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Chatting about math with ChatGPT

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I’m still trying to learn how to use ChatGPT to improve my productivity. One thing I’ve been experimenting with recently is to ask it to check my math. As it turns out, I’m still better at math than the algorithm. Here is a link to a recent discussion I had with ChatGPT. My entries are the short strongly indented statements. In this little conversation, ChatGPT made six separate math errors. Each time it confidently asserted something to be true when in fact it was provably false, and each time it would cheerfully admit its error when I pointed it out.

My recommendation is to keep ChatGPT on a short leash. Don’t ask it anything you can’t directly confirm yourself.