When Indiana was designing its innovative Healthy Indiana program, which offers a segment of the Medicaid population a combination of subsidized health savings accounts and catastrophic coverage, overcoming this limit on co-pays was a big problem.

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Stefaner then queried the Twitter API for users either following five of the seed accounts, followed by five of them, or some combination thereof.

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The targets: members of a nationwide ring that used an inventive combination of old-fashioned thievery and high-tech fraud to loot the bank accounts of unsuspecting victims.

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Managed-money accounts significantly increased their net long position in gold on a combination of new buying and short covering.

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The combination of two factors in the MacDonald case, not likely replicated in others, accounts for this remarkable turn-around.

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Messrs Feldstein and Samwick also assume that retired folk will convert their personal retirement accounts into a variable-rate annuity, based on a combination of stocks and bonds, rather than a fixed-rate annuity.

ECONOMIST: Social Security reform

Vazquez said that a combination of economics and energy-supply issues is impacting Chinese production, which he said accounts for some 43% of global aluminum production.

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"In the last year we started to see a combination of people buying each other's software partners so that they would buy into each other's accounts, " the senior executive said.

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