Toymaker Hasbro has reported made an approach to buy competitor Mattel, resulting in the latter’s stock price rising 24%. The two have discussed a deal in the past, though disappointing sales recently, the collapse of Toys’R’Us and changing buying habits may have precipitated the latest move. Both may have inventory problems. Hasbro’s U.S., seaborne imports have risen 12% in the past six months on a year earlier vs. Mattel’s 7%. That comes against the backdrop of an industry that is also expanding. Total imports climbed 5% in October and may have reached a new high of $2.2 billion. A big...