Because the balance of payments sums to zero, a current account surplus indicates a deficit in the asset accounts and vice versa. A current account surplus or deficit indicates the extent to which a country is relying on foreign capital to finance its consumption and investments, and whether it is living beyond its means. For example, assuming a capital account balance of zero (thus no asset transfers available for financing), a current account deficit of £1 billion implies a financial account surplus (or net asset exports) of £1 billion. A net exporter of financial assets is known as a borrower, exchanging future payments for current consumption. Further, a net export of financial assets indicates growth in a country's debt. From this perspective, the balance of payments links a nation's income to its spending by indicating the degree to which current account imbalances are financed with domestic or foreign financial capital, which illuminates how a nation's wealth is shaped over time. A healthy balance of payments position is important for economic growth. If countries experiencing a growth in demand have trouble sustaining a healthy balance of payments, demand can slow, leading to: unused or excess supply, discouraged foreign investment, and less attractive exports which can further reinforce a negative cycle that intensifies payments imbalances.