Genuinely shocked by the prices of other “expensive countries”

Im currently on holiday and I’m in Japan right now and the price difference actually SHOCKED me, We all know Japan is “crazy expensive” but if Japan is crash expensive the. What is NZ? you could get a really good lunch for 400 yen which is about 3 nzd where in NZ would be about $20 and if you want to eat a very good lunch and treat yourself it’s going to cost you a WHOPPING 900 Yen about 7-8 NZD, cheaper than a McDonald’s burger itself in NZ. Also went to Singapore “worlds most expensive” city or one of the most and although some things like cars cost a shit ton, regular Toyota SUV is. Around 150k NZD there are the food is still bafflingly cheap similar to Japan. Could someone please tell me why these “expensive” country’s have way cheaper food than New Zealand? I don’t think it’s only because “the yen it weak” it’s always been like this every time I go to Japan

Edit- thanks for correcting me I know the price conversion isn’t exact but -2 0s is close enough