A social service! We don't find in today's business 'goals'.

I think today's formula to price anything to sell is roughly 3 times the cost of producing the goods. That is if it costs 5 baht to make a bowl of cooked rice then the bowl of rice is sold for 15 baht. The rational: cost to make must be recovered in full; cost to sell (transport, packaging, rent, salesperson,... must be recovered in full and any profit will be taxed!

Your rice vendor is doing her business for her customers' benefits. We should leave her 'tips'. ;-)