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Table 1 Assessment of underlying hypothesis (overlapping Bank size thresholds)

From: Size, efficiency, market power, and economies of scale in the African banking sector

 

Dependent Variable: Interest Rate Margin

Baseline

Size ≤ 0.25

Size ≤ 0.50

Size ≤ 0.75

Panel A: Controlling for the Unobserved Heterogeneity (FE regressions)

 Constant

−17.380 c (0.000)

9.275 (0.104)

−15.63 c (0.005)

13.163 (0.106)

−16.10 c (0.001)

13.090 (0.053)

−16.501 c (0.000)

11.688 a (0.060)

 Size

7.359 b (0.019)

−1.841 (0.189)

32.865 c (0.000)

−6.581 (0.569)

21.152 c (0.000)

−4.119 (0.386)

15.441 c (0.000)

−3.222 (0.468)

 GDPpcg

−0.029 (0.550)

− 0.018 (0.646)

− 0.141 b (0.045)

0.032 (0.651)

− 0.150 b (0.025)

− 0.0342 (0.548)

− 0.137 b (0.035)

−0.040 (0.470)

 Inflation

0.002 (0.713)

−0.001 (0.843)

0.007 (0.401)

0.006 (0.291)

0.0003 (0.965)

−0.002 (0.788)

0.0006 (0.928)

−0.002 (0.793)

 Pop. density

0.281 c (0.000)

0.032 (0.557)

0.257 c (0.000)

−0.046 (0.610)

0.276 c (0.000)

−0.012 (0.865)

0.282 c (0.000)

0.008 (0.904)

 Loan/Assets

–

−4.527 (0.154)

–

−4.218 (0.311)

–

−3.979 (0.234)

–

−4.759 (0.155)

 Deposit/Assets

–

−2.704 (0.532)

–

−2.637 (0.648

–

− 2.805 (0.545)

–

− 2.499 (0.577)

 Bank Branches

–

0.121 (0.383)

–

0.504 (0.193)

–

0.128 (0.466)

–

0.104 (0.517)

 R2(within)

0.144

0.021

0.221

0.027

0.189

0.019

0.173

0.020

 Fisher

10.24 c

0.92

33.32 c

6.85 c

17.95 c

0.78

15.53 c

0.94

 sigma_u

32.472

6.853

30.455

7.968

32.830

6.100

32.697

5.768

 sigma_e

4.050

3.197

4.329

3.638

4.117

3.377

4.069

3.345

 rho

0.984

0.821

0.980

0.827

0.984

0.765

0.984

0.748

 Banks

146

122

109

92

127

107

130

110

 Observations

737

468

514

327

610

402

641

419

Panel B: Controlling for endogeneity (FE Effects with IV regressions)

 Constant

−12.601 a (0.062)

8.748 (0.151)

−13.481 (0.128)

14.150 a (0.076)

−11.342 (0.151)

12.759 a (0.062)

−10.797 (0.152)

11.802 a (0.065)

 IVSize

8.392 b (0.024)

−0.249 (0.900)

5.380 a (0.085)

−4.429 (0.246)

6.483 c (0.003)

2.444 (0.122)

5.358 c (0.007)

0.103 (0.962)

 GDPpcg

−0.022 (0.659)

− 0.016 (0.692)

− 0.158 a (0.063)

0.0210 (0.767)

− 0.143 b (0.043)

− 0.042 (0.471)

−0.137 b (0.043)

− 0.047 (0.410)

 Inflation

0.0005 (0.942)

−0.001 (0.844)

0.002 (0.808)

0.006 (0.284)

−0.001 (0.806)

−0.002 (0.737)

− 0.001 b (0.807)

−0.002 (0.764)

 Pop. density

0.215 c (0.006)

0.033 (0.564)

0.248 b (0.018)

−0.056 (0.513)

0.230 b (0.017)

−0.015 (0.830)

0.224 b (0.014)

0.002 (0.963)

 Loan/Assets

–

−4.301 (0.168)

–

−4.096 (0.382)

–

−4.347 (0.200)

–

− 4.822 (0.147)

 Deposit/Assets

–

−2.886 (0.510)

–

−2.658 (0.652)

–

−3.231 (0.489)

–

−2.745 (0.545)

 Bank Branches

–

0.129 (0.352)

–

0.488 (0.218

–

0.1741 (0.312)

–

0.122 (0.433)

 R2(within)

0.076

0.018

0.071

0.028

0.070

0.019

0.065

0.018

 Fisher

2.95 b

0.88

2.99 b

7.70 c

4.12 c

0.94

3.62 c

0.87

 sigma_u

25.193

6.949

30.556

8.664

28.384

6.177

27.212

5.691

 sigma_e

4.013

3.219

4.563

3.667

4.214

3.399

4.133

3.368

 rho

0.975

0.823

0.978

0.848

0.978

0.767

0.977

0.740

 Banks

144

122

107

92

125

107

128

110

 Observations

658

464

449

323

542

398

571

415

  1. FE Fixed effects, Size Bank size, IV Instrumental variable, IVSize Instrumented bank size, GDPpcg GDP per capita growth, Pop. density Population density
  2. a,b,c: significance at 10%, 5% and 1% respectively. Bold values denote significant estimated coefficients and the Fisher statistics