id	keyword
economy-585	trade
economy-585	countries
economy-585	african
economy-585	country
economy-585	variables
economy-585	model
economy-585	flows
economy-585	gravity
economy-585	trade flows
economy-585	exports
economy-585	journal
economy-585	bric
economy-585	estimation
economy-585	cent
economy-585	data
economy-585	results
economy-585	rate
economy-585	trading
economy-585	international
economy-585	time
economy-585	land