Most U.S. stocks rose Tuesday following an encouraging update on inflation, though drops for Eli Lilly and other influential stocks kept indexes in check. The S&P 500 rose 0.1% as three out of every four stocks in the index climbed.

US stocks gained after cooler-than-expected producer price index data soothed inflation concerns. The numbers on Tuesday showed wholesale inflation rose 0.2% in December on a monthly basis, compared to an estimated 0.4% increase. The reading climbed 3.3% from a year ago, below the projected 3.5% gain.

Inflation is a term you often hear when discussing the economy, but it can be tricky to understand its impact, especially when it comes to the stock market. For beginners, the relationship between inflation and stock prices may seem confusing.