At low levels of income, most people are willing to put up with some congestion and pollution as the side-effect of growth.
(most people; are; willing to put up with some congestion and pollution as the side-effect of growth; L:At low levels of income) (most people; to put up; with some congestion and pollution as the side-effect of growth)
most people most people
are to put up
willing to put up with some congestion and pollution as the side-effect of growth L:At low levels of income
with some congestion and pollution as the side-effect of growth