Barack Obama is Paid $400,000 (start of para 2) - Lee Hsien Loong (LHL) is paid $3.1 million. Does this mean that LHL has more responsibilities than BO? Why?

LHL may be paid more but he may not have more responsibilities than BO.

Singapore is a dot on the map while America is a much larger country. There would be more land and more people under the care of the American government. Although both countries' governments must consider global responses, the responsibilities of the American government does seem larger. This is especially so because America is a leading country in terms of certain aspects such as development. America does not only govern itself but takes charge over issues in other countries through the UN, or military and so on. As a more global leader, BO may have more responsibilites than LHL.

Although BO's pay is less than LHL's, the benefits of their jobs are different. In America, the government lives in the white house, is supplied with a car and has servants he does not need to pay wages to. In Singapore, a politicians pay is the total monetary value of what the politician receives. There are no public perks to the job.
Thus, it is hard to determine whether the disparity between the two incomes are that high or not.