id	keyword
ajfa-3998	event
ajfa-3998	rating
ajfa-3998	returns
ajfa-3998	high
ajfa-3998	post
ajfa-3998	firms
ajfa-3998	upgrades
ajfa-3998	case
ajfa-3998	downgrades
ajfa-3998	pre
ajfa-3998	bond
ajfa-3998	change
ajfa-3998	stock
ajfa-3998	effect
ajfa-3998	journal