Loan sellers and servicers doing business with Freddie Mac will be charged a so-called low-activity fee for not meeting new quotas for loan deliveries and mortgage servicing beginning next year, according to a policy change announced recently by the government-sponsored enterprise. Freddie Mac said it will assess lenders a fee of $7,500 if they fail to deliver mortgage loans with an aggregate principal balance of more than $5 million or service mortgages for the GSE with an aggregate balance of at least $25 million. Freddie will begin monitoring loan sales and servicing beginning this year and imposing the low-activity fee on slackers on Jan. 1, 2014. There were at least 277 lenders that sold...