The Head Count Ratio (HCR) simply measures the percentage of the population below the poverty line. It provides no information about how far below the poverty line the poor are. The Poverty Gap (PG), on the other hand, measures the average depth of poverty; it quantifies the aggregate income (or consumption) deficit of the poor relative to the poverty line. The total poverty gap (sum of shortfalls for all poor individuals) represents the minimum cost of eliminating poverty through perfectly targeted transfers, making it a more informative measure for policy design.