I'm from the Philippines, and the average cost for a simple lunch could go as low as $1 and is usually divided as P15 ($0.30) for one cup of rice and P35-P50 ($0.70-$1) for the dish. For people who are into Fast Foods, the most affordable decent meal one could get is within the $1-$1.5 range. 

For medium to well-known restaurants however, the price is usually double or triple that amount. As for me, the average cost of my meal is only around P100+ ($2+)