When manufacturers such as pampered chef sell directly to consumers, they perform both production and retailing activities?

That statements is true

Manufacturer is a type of business that transform raw materials into a sellable goods, so technically they can be considered as a producer in the market.
Retailers is someone that sell the goods that produced by the manufacturers to the consumers.

So, in this case, they did perform both production and retailing activities

Force bc it says the ability to make stuff happen