What does 'Tobin's q' ratio measure in corporate finance and macroeconomics?

💡 Solution & Explanation

Tobin's q ratio is defined as the market value of a company divided by the replacement cost of its physical assets, serving as a key indicator for corporate investment decisions. Alternative financial ratios measure debt-to-equity leverage or short-term liquidity rather than comparing market valuation to capital replacement expenses. When Tobin's q exceeds one, management is incentivized to invest heavily in new capital goods because the market values assets above their production cost. Nobel laureate James Tobin introduced this metric to link financial markets with real economic activity.