Sharu said:
Please explain me, why the prices will go up and quality will drop? |
if the ban had been on only a given food product among food products the demand would be inelastic
example : no enough apples -> people buy more pears instead -> not much impact on prices
so on the curve below the equilibrium of apples will move from right to left (and the index of P rises less than 1 times the index of Q lowers)

but since the food ban concerns the entire food offer you can't substitute food with anything else than food - so russia will follow the typical "inelastic" curve
again - equilibrium point moves from right to left (and the index of P rises more than 1 times the index of Q lowers)

http://www.investopedia.com/university/economics/economics4.asp
For the quality issue it's simply that competition will not be a problem for either farms and productions nor for distribution. Whatever they get they know they will sell.







