Inflation at the producer level (per the Producer Price Index, PPI) is arguably an advance indicator for inflation downstream at the consumer level (per the Consumer Price Index, CPI). Do investors reliably react to changes in PPI as an indicator of the future wealth discount rate? In other words, is a high (low) producer-level inflation rate bad (good) for the stock market? Using monthly, non-seasonally adjusted PPI from the Bureau of Labor Statistics (BLS) and S&P 500 Index levels as available during December 1927 through July 2023, we find that:
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