266 VALUATION, DEPRECIATION AND THE RATE-BASE 
COPPER 1880-1914 
: pRNAL AVER GE : rer. Lb.) 
|_so18 I 3 Xi $0.18 
~ 0.16 0.16 
o | 
A014 W| 0.14 
IRL - 
o 0.12 0.12 
Q 
& 
0.10 | 0.10} 
| 0.0% | 0.08] 
Pound- 
1200009¢ 
11000 0€ ¥* Co 
3000016 
16000000“ 
I 4000000" 
| 2000000° 
3. 4. 
SILVER 1880-1914 
$1.40 | ‘ TT CRE i 
8 ry IE EED 
fs 1.2000 [F& 
ie ; 
gz | | 
5 [| 0.90 
20.80 I | 
0.50] 
A 0.60 
1 4 0:50 
. . Yo 
Ounce ro 0 000 
| 60 000 
00 
| 50 00° 
“0.000 
40 000 Ls 
|| 
tA (00 000 
| — 
(50 000 Gr ft 
ey 
FiG. 5.