Rate of increase in prices = inflation = first derivative of prices. Slowing the rate of increase in prices = lowering inflation = second derivative. I wouldn't

Rate of increase in prices = inflation = first derivative of prices. Slowing the rate of increase in prices = lowering inflation = second derivative. I wouldn't interprete 'making progress in lowering the rate of increase' as 'lowering the rate of increase of the rate of increase' which is basically how you'd have to read that to get to the third derivative. As the article points out, Biden was talking about MoM inflation, I quoted the numbers there for those months. They're in the article.