Closer integration of neighbouring economies has often been seen by governments as a first step in creating a larger regional market for trade and investment. This is claimed to spur greater efficiency, productivity gain and competitiveness, not just by lowering border barriers, but by reducing other costs and risks of trade and investment. Bilateral and sub-regional trading arrangements have been advocated by governments as economic development tools, as they been designed to promote economic deregulation. Such agreements have also aimed to reduce the risk of reversion towards protectionism, locking in reforms already made and encouraging further structural adjustment.