Actually, the hawkers should start to follow McD's style and
introduce Small, Medium and Large sizes. Maybe, also offer
meal sets that you can 'upsize'! 
Eg. "Auntie / Uncle! I want to order Medium chicken
rice upsize to add char siew!"
OR
"Auntie / Uncle! I want to order Small Char Kway Teow, no
hum, upsize to add another small Orh Luak!" 
OR
"Mak Chik! Nasi Sikek, but sambal goreng upsize sia?"

don't get me started on the fast food .....
the burger sizes from McCrap's so pathetic nowadays ......
the only good thing ... is that the chicken pieces from KFCs'
still as big .....