@article{economics2007-6,
 author = {Marco G. Ercolani},
 title = {Hidden Economies and the Socially Optimal Fiscal-Tax to Liquidity-Tax Ratio},
 journal = {Economics: The Open-Access, Open-Assessment E-Journal},
 volume = {1},
 year = {2007},
 number = {2007-6},
 url = {http://www.economics-ejournal.org/economics/journalarticles/2007-6}
}