Advertising a product changed from simply announcing the existence of a product in a dull, dry fashion to persuading the public they needed and deserved to own the product. By developing repeat customers, advertising also helped build brand loyalty for the company.
There were many difficulties that traders faced during the Vedic Age, but perhaps the greatest issue that was faced was a basic lack of supplies and resources.
According to Albert Barnes, their mistake was that they didn't speak against slavery. Although many of them believed that slavery was against god and against the idea that god made everyone equal, they didn't do much against it out of many reasons, either they thought it was a necessary evil or they were afraid of the public reaction.