Why East India Company had found it difficult to ensure a regular supply of goods for export?

Before establishing political power in Bengal and Carnatic in the1760s and 1770s, the East India Company had found it difficult to ensure a regular supply of goods for export. The French, Dutch, Portuguese as well as the local traders competed in the market to secure woven cloth. So the weaver and supply merchants could bargain and try selling the produce to the best buyer. In their letters back to London, Company officials continuously complained of difficulties of supply and the high prices.