Units are bundles of common stock and warrants. By selling initial pub
lic offerings (IPOs) of units, firms precommit to sell more stock in t
he future at the warrant's exercise price. Sequential offerings of thi
s type reduce the agency costs of giving management a potential free c
ash now at the IPO. Consistent with this theory, firms that choose uni
t IPOs are smaller, have less income and assets in relation to their I
PO proceeds. and are less likely to survive than firms that issue shar
es.