not so simple questions...
1. theorectically, yield curves are influenced by
a. time value, price to pay to spend the money now rather than later.
b. inflation expectation
c. risk premium (ie. insurance for the likelihood that your expectations may go wrong)
d. technical
So any or combination of any of the above can change the shape of the curve. they are hard
to split, unfortunately.
2. ceteris paribus, curve would shift up with higher inflation expectation.