Like most of economic theory, the mechanism must work either through 'prices' or through 'quantities' (or some combination of both). A stark outline of the price-story would be the following: an increase in Government spending, given its revenue, (a higher Government deficit) will cause inflation, hence raising prices for goods produced in India. As a result (at a given exchange rate), people will buy cheaper foreign goods rather than Indian goods which will widen our trade (or balance of payments) deficit. Thus, the size of the trade deficit will increase until it matches the government deficit. In this way, it will restore the definitional truism mentioned above (assuming private sector income and expenditure is throughout in balance). A similar mechanism would also work in the opposite direction. A reduction in the Government deficit would correspondingly reduce the trade deficit by making us more price competitive in the world market. This theory can be embellished in many ways with algebraic 'models', statistics or historical anecdotes, but the basic storyline remains. And this is the story-line the IMF advocates, which is shared, almost uncritically, by its admirers in our government or academia.