{ , . rI(3-6km+4k3)+3rD f I D D
βc + -i—6(i-kβm— for rI ≤ 3rD
(26)
βc + 4rI 6 3 for rI > 3rD,
6(1-km)
respectively. Using the expressions for km and kc in (20) and (21), those for cc and cm in
(25) and (26), Dm = Rm + L1 + L2 and Dc = Rc + Lc, we can write the expected profits
for the merged banks and competitors when reserves are chosen optimally as
Πm = r1LL1 + r2LL2 - cm(L1 + L2)
Πc = (r1L - cc)Lc,
where
Lm = L1 + L2 =
l-γ
r1L
1N
-1 X
N ʌ
j=1

+ L-γ
1N
-1 X rL
vʌ j
j=1
(27)
and Lc is given by (2). The first order conditions are then given by
∂ ■ ∂LL1 ɪ L L ^L2_
l L = Lh + (r1 - cm) ^TΓL + (r2 - cm) ^TΓL = 0 for h = 1, 2
∂rh ∂rh ∂rh
(28)
—c = Lc + (riL — cc) = 0 for i = 3...N.
∂rL c i c ∂rL ... .
(29)
We look at the post-merger equilibrium where r1L = r2L = rmL and riL = rcL . Substituting
(27) in (28) and (2) in (29), we obtain the best response functions as
L l cm rL
rL =---.r „ + — + -c-
m 2γ( nN2 ) 2 2
(30)
L l N—1 2 L
rc = γ( N+1 )+( N + 1)cc + N + 1 rm. (31)
Solving (30) and (31) gives the post-merger equilibrium loan rates rmL and rcL . Substituting
rmL and rcL respectively in (27) and in (2) gives the equilibrium Lm and Lc. Analogously, we
derive Dm and Dc. Q.E.D.
Proof of Corollary 3
33
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