The effect on the economy would be determined by several factors.

 - Is there a minimum distance FTL can be utilized?  Are we talking feet, miles, light years? 
 - What is the smallest FTL drive available? Is this a pocket, backpack, vehicle, warehouse, star ship application?
 - Can FTL be used on Earth or is it limited to space travel?  Of course, answering the first few questions may very well answer this one.
 - How difficult to obtain or how expensive is the exotic matter? 
 - Who controls the technology?  The answer to this question will determine what or whose economy is affected.