I work in the modern trade and lower retail trade industry.. with about RM150k.. in my opinion, you could open a very comprehensive convenient mart with you own branding.. On the 80/20 rule, I can say it is true.. 20% of your products would bring in the bulk of your income.. the remaining ones are to complement your core selling products..

In general, many business strategies could be used in a grocery shop/convenient mart to build up repeated customers; depending on the person's experience and business acumen..