I never understand why these shops have so much liquor .   What do you mean ? It's because it's much cheaper to buy liquor duty-free .   But why ? Why don't people like to buy shirts duty-free ? Or shoes ? I just don't understand why it's always liquor .   Well , it's because in most countries liquor has a higher tax on it .   You mean liquor has a higher tax than other things ?   Yes , of course . Didn't you know that ?   No , I didn't . How high is the tax ?   Well , it is different in different countries.But it's because of the high tax that buying liquor duty-free is such a good deal . 