Goods sold in the weekly market are cheaper because:
a. Weekly markets do not have permanent structures, they don't have to bear the expenses of paying rent, electricity bills and other fees which adds to the cost of the production and makes products expensive.
b. These markets sell products of daily requirements, with their family members involved in it, hence they do no hire workers and pay salaries.
c. Since there are others selling same products in weekly markets, there is a lot of competition, therefore products are cheaper and it is also easy to bargain.