TREASURY BORROWING costs are still rising. Latest offering of $2 billion in 245-day tax-anticipation bills sold at an average yield to buyers of 4.783%, the highest rate paid on such securities since 1921.

ANTITRUST ACTION against General Motors is mounting. Justice Department filed suit in Manhattan Federal Court to force G.M. to give up its Euclid Division, which it acquired in 1953 for $18 million. Trustbusters charge that G.M.'s control of Euclid (80% of off-highway trucks, 5% of overall market) tends to create a monopoly.

TEEN-AGE CREDIT plan will be tested by Sears, Roebuck, which will give up to $50 credit to youngsters 14 and over, with $5 monthly repayments. If tryout in 18 stores is successful, Sears will expand service.

RADAR FIGHT is brewing between Federal Aviation Agency and Air Transport Association. FAA wants weather radar on all four-engined passenger planes, but airlines, which have ordered radar on nearly all new planes, argue that it would be too expensive (up to $80,000 per plane) to equip old craft.

DESALTING OF SEA WATER, which many governments are studying in hopes of finding an economic conversion process, is well along in the U.S. as part of a $10 million program. Carrier Corp. is testing a promising new method at a $150,000 pilot plant that will desalt water by freezing it, trapping salt crystals between fresh-water ice crystals.

MENTHOL CIGARETTES, which have come from 5% to 10% of the market in two years, will double their share to 20% in next two years, predicts Lewis J. Gruber, chairman of P. Lonllard Co. (Kent, Old Gold, Newport). Gruber says smokers like mint and menthol sensations, but will not embrace new tastes--pineapple, cinnamon, apple blossom.

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