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James Tobin

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description James Tobin Overview

James Tobin was an American economist associated with Keynesian macroeconomics and the study of financial markets. He received the 1981 Nobel Memorial Prize in Economic Sciences for analyzing financial markets and their relationship to spending, employment, production, and prices. His name is also attached to Tobin's q, a ratio comparing a firm's market value with the replacement cost of its assets, and to a proposed tax on certain currency transactions.

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What is Tobin's q?

Tobin's q compares the market value of a company or its assets with their replacement cost. A high q can signal that creating new capital is attractive relative to buying existing assets, linking financial-market valuations to real investment.

What did James Tobin mean by the Tobin tax?

Tobin proposed a small tax on foreign-exchange transactions to discourage very short-term currency speculation. The idea is distinct from a general tax on every stock, bond, and derivatives trade, although later proposals often use his name more broadly.

Why did James Tobin receive the 1981 Nobel Prize?

Tobin was honored for analyzing financial markets and their connections to expenditure, employment, production, and prices. His portfolio-selection work showed how investors divide wealth among assets with different risks and returns.

How does Tobin's portfolio theory extend Keynesian economics?

Tobin developed models in which people choose among money and multiple risky or interest-bearing assets rather than making a simple money-versus-bonds choice. This helped connect asset prices and risk preferences to investment and broader economic activity.

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