Final answer:
Restrictive practices that do not contribute to flexible accumulation of profits can hinder the ability of firms to generate higher profits in a flexible manner. Examples include tying sales, where customers are required to buy one product only if they also buy another product.
Step-by-step explanation:
Restrictive practices that do not contribute to the flexible accumulation of profits can include practices that reduce competition without involving explicit agreements between firms to raise prices or reduce production quantities. These practices can hinder the ability of firms to generate higher profits in a flexible manner. For example, tying sales is a restrictive practice where customers are required to purchase one product only if they also buy another product. This can limit the flexibility of firms to maximize their profits.