Company A plans to acquire Company B.

Both firms operate as wholesalers in the fashion industry, supplying a wide range of ladies' clothing shops.

Company A sources mainly from the UK, Company B imports most of its supplies from low-income overseas countries.

Significant synergies are expected in management costs and warehousing, and in economies of bulk purchasing.

Which of the following is likely to be the single most important issue facing Company A in post-merger integration?