Dollars and Sense…I’ve taken the time to breakdown the different contracts to let you all know which one is the biggest bang for the buck. I have broken them into four categories: Short (5mins to 1 hr), Medium (1.5 hrs to 6 hrs), Long (6 hrs to 24 hrs) and Very Long (24hrs+). Listed below are the top five in each category.
Short (5 mins to 1 hr)
#1 Puffies –> 4020/hr
#2 Slinky –> 3800/hr
#3 Fertilizer –> 2780/hr
#4 Sailboat –> 2450/hr
#5 Dress –> 2340/hr
Medium (1.5 hrs to 6 hrs)
#1 Coffee Table Books –> 1040/hr
#2 Beds –> 968/hr
#3 Solar Panels –> 875/hr
Long (6 hrs to 24 hrs)
#1 Beef –> 805/hr
#2 Recliner –> 728/hr
#3 Crane –> 666/hr
#4 Tires –> 662/hr
#5 TVs –> 641/hr
Very Long (24+ hrs)
#1 PC –> 500/hr
#2 Cars –> 391/hr
#3 Motorcycles –> 381/hr
#4 CDs –> 362/hr
#5 Microchips –> 287/hr
Take into consideration the $20 cleanup fee that is charged every time that you build. For example, while Puffies profit is 4020,per hour, after the fee, it works out to 3780 profit (-$20*12). The slinky has almost identical profits (3720 after everything said and done), but is 15 minutes, and that excludes the time to process the contract. So, if you are playing short term contracts, the Slinky is the most efficient use of your time. The only drawback is, the cost of the contract, if you do not collect it in time, you will have lost a large amount of your investment.
As you can all see there are many different contracts that are out there…so depending on how much time you have available, use your time wisely to get the biggest bang to make dollars and sense.
Maybe the developers will hook me up with some extra “coin” for helping everyone out 
GOOD LUCK!
Scraped from http://wiki.answers.com/Q/What_are_the_best_contracts_on_Social_City
