Stamps-on-stamps topicals are very popular worldwide, and although Luxembourg is a small country, its stamps are widely collected, especially in the Benelux countries.
A nation of about a half a million people, Luxembourg has a highly developed economy, with the world's second highest GDP per capita. Its stable, high-income economy features moderate growth, low inflation, and low unemployment. The industrial sector, which was dominated until the 1960s by steel, has diversified to include chemicals, rubber, and other products. During the past decades, growth in the financial sector has more than compensated for the decline in steel. Services, especially banking and other financial exports, account for the majority of economic output. Annual GDP growth has averaged 2.3% over the last 5 years, despite a major recent contraction due to the global financial crisis.
Those interested in learning about investing in stamps should read the Guide to Philatelic Investing ($5), available on Kindle and easily accessible from any computer.