Lunch box

Lazy to cook during Public holiday,
bought two lunch boxes from outside,
one was rice with pork chop from the restaurant,
the other was from the vegetarine shop,
each costs MOP 30,
on my way home,
thinking that simple lunch is not cheap,
then passed by the Philippine food shop,
as usual,
many asians were eating there,
there were many cooked food on the kitchen table,
and there was a notice stating "meal forMOP18",

From the price difference,
I believe there are many reasons behind!