Yes, let’s be Europe
“The Italian economy is also affected by a large underground economy—worth some 27% of Italy’s GDP. This production is not subject, of course, to taxation and thus remains a source of lost revenue to the local and central government.”
http://globaledge.msu.edu/countryInsights/economy.asp?countryID=59®ionID=2
“A different source of data on underground economy in Italy is the Ministry of Finance, which has recently estimated a yearly time series of the non-reported Value Added Tax base (Marigliani and Pisani, 2006). This issue is crucial, since evading VAT means underreporting production, labor activities and revenues. Hence, this time series estimate for the period 1980-2003 can be used as a proxy for the size of underground production. With regard to underground employment, ISTAT provides a yearly time series covering the period 1980-2004 for the country as whole. The ISTAT method of estimating the size of underground employment (labor input method) is well described in OECD (2002). It is worth stressing a statistical feature of the data analyzed. The available time series estimate of the irregular labor input deals with full time equivalent workers: the data include both the numberof underground working positions and irregular worked hours.”
The American people need to learn how to get together and trade services. No cash involved. No taxes. No paper trail.
Just call it a politically correct name - like "sharing."