Tokyo is not expensive, it's just that you are using Singapore
pay to spend in Japan. 
Ask the Tokyo Mcdonalds' front line staff how much they make an
hour. 
Ask Australian Mcdonalds' server how much they make an
hour. 
Singapore is a developedd country with 3rd world wages.

purchasing power parity..
the MIW decided to "compete" using low wages... and refused to
move the economy towards a higher wage/value add system.. maybe out
of greed, maybe out of sheer selfishness because they didn't want
their personal wage advantage eroded away...
so we get what we have in Singapore now... where the price of
everything is out of control and we don't have the wage or economic
structure to move on...
in that way, we were sold down the river...
in the meantime, if you want to visit places with the PPP higher
than Singapore, be prepared to spend a crapload.. but it does
expand your outlook on things.. see how the other parts of the
world lives and what we can become...