Google AdWords is not cheap, however, if you can get more clicks & a higher click through rate, your cost per click will drop.
1 of the most powerful ways to get more clicks in a shorter time is simply to add urgency to your pay per click ads.
Quantity Limit If you are selling products, you can limit the quantity, these are the words which you can use...

• limited availability
• limited quantity
• selling out fast
• only 7 available
• only 7 left
• less than 13 left
• get 1 of the last 17
• supplies are running out
• while supplies last
• while you still can
• the next 7 orders will get
• almost gone

When using numbers, you want to make sure you use some odd numbers (such as 7, 9, 13, 17, 23, 27 & more) so that it is easier for people to believe what you say.
Time Limit For almost anything that you are selling, you can give a time limit, these are the words which you can use..
...

• limited time only
• today only
• this week only
• holiday special
• before it is too late
• price going up soon
• while it is still available
• special sale ends soon
• special offer ends soon
• buy now & save
• order before X & Get Y
• free shipping until
• free Shipping today only
• time is running out
• last chance

When using time limited offers, make sure you explain it clearly so that people will believe you rather than thinking that you are just trying some silly marketing gimmick.
Reason Why Many people actually failed while trying to use scarcity tactics because nobody believes them! Whenever you want to use such tactics, give people a real & reason why they must act now.
When your reason is good, you will see your response rates shoot through the roof.
Summary By now, you probably realized that urgency is created by scarcity.
Based on some studies, scarcity is 1 of the most powerful factors that influence people to take action immediately.
This is powerful, do not abuse it!