# Thread: when p is equal

1. ## when p is equal

I have these two equations:

D0 - dp
S0 + sp

find value p, such that supply and demand is equal.

My assumption is to set p - p = 0, so that the equation is

D0 - dp - S0 + sp = 0

I solve to get

p = D0 - S0/ d - s,

but the answer in the book is

p = D0 - S0/ s + d,

I am not able to understand how they got this answer.

I have these two equations:

D0 - dp
S0 + sp
Where you see the equations?

3. first one is demand
second one is supply

4. Solve $D_0 - dp = S_0 + sp$

Isolate p on one side and factor it out. That equation will be valid when supply = demand