Final answer:
Cash cows in a BCG matrix are high market share units within slow growing industries that generate significant cash flow with minimal investment.
Step-by-step explanation:
In a BCG matrix, business units categorized as cash cows are high market share units within slow growing industries. They are considered cash cows because they generate a significant amount of cash flow with minimal investment, thanks to their established market dominance. These cash cows typically require limited resources to maintain their market share and profitability.