The document discusses the concept of time prices and how they can be used to analyze the cost of goods and services over time when accounting for changes in income levels. It provides examples of calculating time prices for a Thanksgiving dinner in 1986 and 2018 based on unskilled, blue-collar, and upskilling hourly income rates from those years. The time prices, expressed in both hours and minutes per person, decreased substantially from 1986 to 2018 for all income groups due to rising hourly incomes outpacing food price inflation.