@TechReport{economics.dp.2007-10,
 author = {Ercolani, Marco G},
 title = {Hidden Economies and the Socially Optimal Fiscal-Tax to Liquidity-Tax Ratio},
 type = {Economics Discussion Paper},
 institution = {Kiel Institute for the World Economy},
 year = {2007},
 number = {2007-10},
 url = {http://www.economics-ejournal.org/economics/discussionpapers/2007-10}
}