Balance of payments
Balance of payments is a metric that collects all the transactions between countries. The result is expressed in a particular region's currency and compared with other regions. In forex, a country with a positive balance of payment simply means that there are more investments coming in to the region which boosts the value of the currency. A negative balance of payments signifies that investments are flying out of the region. A weaker currency will result since the migration of investments overseas requires the sale of the region's currency into another.