What are the various ways by which people may be exploited in the market?

Consumers (People) are exploited in the market by
(i) Charging high price of the product.
(ii) Mlt giving proper after sale service.
(iii) Less measurement.
(iv) Ujnder weighing goods.
(v) Selling substandard quality goods.
(vi) Adulteration.
(vii) Negligence in service.