An unidentified individual has been arrested on suspicion of stealing 84 smartphones, possibly instigated by a 'shadow job' in Japan. The crimes reportedly occurred over a short span of time and are related to the rising issue of 'grey labor markets' or underground work, often illegal, that is becoming more prevalent in technology and retail sectors. The police are investigating the matter thoroughly to uncover possible links with criminal networks.

Japan is known for its stringent law enforcement and low crime rates. However, this issue brings to light the emergence of 'grey (black) labor markets' feeding the increasing smartphone black market. This issue underlines the social problems related to unemployment, underemployment, and attractive illicit avenues of income in Japan, especially among younger demographics.

In the US and EU, similar issues are indicative of larger socioeconomic disparities. Crime rates are usually higher, and stolen tech equipment often finds its way to black markets—similar to what we're seeing in Japan. However, law enforcement agencies in the western world are robust and continually working on curbing such activities with advanced technology and stricter monitoring.