Possible Clues:

• No good merely to encourage economy
• Not wan Ted
• Environmental slogan, or a hint to this puzzle's theme answers
• Don't be so extravagant - it's no good
• Make economies? It's no good
• Be more saving, perhaps. No good
• Futile ration
• Futile economic policy
• 'The ___ Precaution' (alternate title of 'The Barber of Seville')
• Consume a smaller quantity? It's of no avail!