Economist Insights on Time and Pricing

The question asks to identify the first economist who highlighted the importance of considering the viewpoint of time when studying the pricing problem. This involves understanding how prices are determined and how they change over different durations.

Alfred Marshall's Contribution to Time in Economics

Alfred Marshall, a highly influential economist, is renowned for his work in introducing and analyzing the concept of time within economic models, particularly concerning price determination. In his landmark book, Principles of Economics (1890), Marshall distinctly separated economic analysis into different time frames:

• Market Period: An extremely short period where supply is relatively fixed. Prices are mainly determined by immediate demand.
• Short Period: A period long enough for producers to adjust output partially, but not enough to change the scale of fixed capital.
• Long Period: A period sufficient for all adjustments, including changes in the scale of production and the number of firms, to take place.
• Secular Period: A very long period allowing for changes in population, habits, capital accumulation, and technology.

Marshall argued that understanding price requires considering these different time horizons. He famously used the analogy of the scissors, where one blade represents demand and the other represents supply. The point where they intersect determines the price, but how that intersection behaves depends heavily on the time frame considered (short-run supply vs. long-run supply). He showed that demand might be the more significant factor in the very short run, while supply conditions become increasingly important over longer periods.

Comparing with Other Economists

While other economists listed made significant contributions:

• Adam Smith laid the groundwork for classical economics, focusing on concepts like the division of labor and the "invisible hand," but did not systematically analyze price determination through the lens of time as Marshall did.
• Francis Ysidro Edgeworth advanced mathematical methods in economics and introduced concepts like the Edgeworth box and indifference curves, focusing more on utility and exchange theory.
• Frank Knight is known for his work on uncertainty, profit, and competition, particularly his book Risk, Uncertainty and Profit, rather than the temporal aspect of pricing.

Therefore, Alfred Marshall stands out as the economist who explicitly and systematically incorporated the viewpoint of time into the analysis of the pricing problem.