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 |