While Singapore isn’t the most expensive place to buy groceries, it is the most expensive place in the world to buy and run a car. Transport costs in Singapore are 2.7 times higher than in New York. It is also very expnsive to buy clothes and pay for utilities bills in Singapore.
The overall cost of living in Qatar is similar to that in most European countries, if you’re living in the style of the average western expatriate. But the general lack of taxation has a significant impact on the cost of certain items, e.g. cars. On the other hand, the cost of accommodation is sometimes high, as is that of certain food items, particularly imported foods.