Simple Models: Small Country in Large Union; Small Union as a Whole.- Small Union: Small Union of two Countries; Small Union of Three Countries; Small Union of Ten Countries; No Capital Mobility between Union and Rest of the World.- Small Union and Associated Countries: Small Union as a Whole; Small Union of Two Countries.- Large Union: Large Union and the Rest of the World; Small Country in Large Union; Large Union of Two Countries; No Capital Mobility between Union and Rest of the World.- Large Union and Associated Countries: Large Union as a Whole; Large Union of Two Countries.