When a single firm has control over the market supply of a resource that is essential to the production of a good,?

The likely result when a single firm has the control over the market supply in regards with the resource that is essential in production of the goods is that there will be a frequent result of monopoly. Monoploy is where the seller in the market does not have any competition to face because the seller is the only seller of the goods that is being produced because there are no substitute with the product.