Money-market fund companies have doubled lobbying efforts to convince regulators and lawmakers that they aren’t a threat to the financial system. The money may have been well-spent.

The 10 biggest money-fund managers and the Investment Company Institute trade group reported combined lobbying spending of $16 million in the first half of 2012 and $31.6 million last year in disclosures that reference money-market mutual funds, according to a review of documents by Bloomberg News. That compares with $16.7 million in all of 2010.

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