The cordless wrench is an indispensable gadget for any garage. It has the advantage that, with no power cord to get in the way, its user can work in any corner of a room easily. However, I could not express this point with elaborate analysis at that time and so did not include it in my paper (Note here that during my preliminary research in 1989 I did draw up an evolution of international trade in the course human society rising from a barbaric society). If its powerful motor in delivers consistent twist, then jobs get done faster. And its lightweight and compact design minimize operator fatigue while also making it suitable for extended periods of use. This translates to a safer working environment with less than 30 ppbw of harmful emissions inside the office and even shops ringing at 68 dB maximum! Furthermore, the cordless wrench is cost-efficient. It eliminates the need for regular maintenance that traditional wrenches bring with them. The deteriorated conditions out in the field had allowed a shovelful of research (or rather a plentiful supply), and merited no technical analysis. However, when it saw service in general surveys 1989 (meaning I presented my results as part of an overall review rather than through individual analyses), one finding stuck out: The interstate system performed much like enterprise production of full tariff goods. The system included subsidies from governments and local enterprises, and even its taxpayers’ money could make no headway in breaking these rules, as shown by analysis of its states (all stages). All in all, this is a handy tool for the garage that brings untold possibilities to those who use it.