I've witnessed first hand the collective hysteria when an ice cream company raised their prices by 10 yen[0] and also had to put up with coworkers banging on in excitement whenever 7-11 has an Onigiri sale dropping from 110 to 100 yen. Not to mention the queues stretching around the block when Yoshinoya cuts a buck and a half off their beef bowls.
My anecdotal evidence, based on looking in shop windows, is there's plenty of part time (arubaito) jobs on offer; the problem is young people are too smart to take them up on their pitiful 700 yen per hour offers, which in Tokyo barely cover your transport and lunch costs. And yet the businesses will continue to weep and wail and gnash their teeth because they can't find anyone. It's not rocket science.
[0] https://qz.com/656080/a-japanese-ice-cream-maker-deeply-apol...