21.   In August, FDA rules take effect that ban most cigarette vending machines and curb tobacco advertising targeted at teens.

22.   In its response, the Justice Department argued on narrow grounds that such an injunction was not necessary now because the rules have not taken effect.

23.   In that circumstance, the court said, the state rule takes precedence.

24.   In other words, the new rules take away the safety net that long-term bond investors now have, with no offsetting advantage.

25.   It seems a rule like this takes away a lot.

26.   It was the fifth time in three days the rule took effect.

27.   Mexico agreed to lower the amount of reserves banks need to set aside to cover troubled loans, as tougher accounting rules took effect.

28.   New securities rules will take effect next month that permit companies to offer shares to the public if they meet certain conditions.

29.   New rules took effect in March that will allow businesses and eventually consumers to choose their electricity supplier much like they pick a long-distance telephone company.

30.   New rules took effect last month tightening safety requirements for air tour operators in Hawaii, where a recent spate of crashes has alarmed federal safety officials.