> How much of the price of a consumer good is determined by the number of employees working to produce that consumer good?

While that cost is factored into the cost of a product, the profit margin can be arbitrarily decided.

In a healthy economy, supply and demand is key, but we're in a new age of artificial scarcity where key manufacturers can restrict the flow of a product to boost prices and deny products to the multitudes. Housing, healthcare, fuel, electronics, virtual goods, etc are good examples.