a) Consumers fill out questionnaires concerning their need for new products.
b) Consumers vote for politicians who decide which kind of research to support
c) Consumers decide what to buy and what not to buy
d) Consumers influence the decisions of private foundations by deciding where to donate money.
My answer would be: c) Consumers decide what to buy and what not to buy
Every growth is based on the demand of the people. If a good or service is needed then its demand will increase. If a good or service is not needed then its demand will decrease until such time that said good or service will be eliminated.