A cash cow is a reference to a business, product, or asset that produces consistent cash flow over its lifespan. It's also a reference to one of the four quadrants in the BCG Matrix, a business ...

Froot, K. A. "Consistent Covariance Matrix Estimation with Cross-Sectional Dependence and Heteroskedasticity in Cross-Sectional Financial Data." Journal of Financial and Quantitative Analysis 24, no.