Market Everywhere

I was looking up events held in Kirkstall Abbey, and found there are market days in Kirkstall. 

It is good for customers to see market stalls and produces and goods from small producers, but is it good for the traders?

For a few days in a month, the big supermarkets may have a tiny dip in their trade, or alternatively, a few days later, families has more food waste.  For a trader to see good trade for the odd weekend, it may give them false sense of their trade, who may then mistakenly embark on a permanent shop.

I am mostly a browser, so all these markets are very entertaining for me.