The growth of an economy is a function of consumption, investment and net exports. The movement of these factors in tandem is a prerequisite of sustainable economic growth. Big variations in any one of these without appropriate support from the other two makes economies vulnerable to crisis. This theory explains why India has been prone to external shocks over the past five years. The share of consumption in real GDP has increased about five percentage points to 71% over the past five years, while the share of investment has remained more or less constant. Such high consumption rates are not sustainable for an emerging economy such as India. This has resulted in an increased reliance on external flows, rendering the country vulnerable to global shocks. Hence, a weak global economy has resulted in the rupee depreciating around 35% since FY08.