I propose a neoclassical production economy with costly external financing, partial investment irreversibility, and endogenous investment/financing decisions to rationalize and quantify the well-documented interaction between the book-to-market equity effect and the financial leverage effect in...

We examine a simple measure of operating leverage: the ratio of fixed costs (measured by depreciation and amortization plus selling, general, and administrative expenses) to the market (or book) value of assets. We find that this measure of operating leverage positively predicts returns....