(S (S (BASENP (PRP It)) (VP (MD would) (VP (VB be) (NP (NP (BASENP (DT the) (JJS largest) (NN collapse)) (PP (IN of) (BASENP (DT an) (NN investment) (NN firm)))) (PP (IN in) (BASENP (NN 18) (NNS years))))))) (PERIOD .))