FARMERS^ EARNINGS IN SOUTHEASTERN PENNSYLVANIA 
51 
As shown by these results, farm dwellings on the smaller farms 
worth up to 85,000 added as much as their value or more to the farms 
on which they were built, especially for farms under 30 acres. Most 
of these farms were more nearly country residences than true farms, 
and were in demand for their value as residences rather than for 
their value as farm property. 
For larger farms the dwellings did not add their full value to the 
farm value, a 84.000 dwelling adding only S3, 900 to the value of a 
NET RELATION OF SEVERAL FACTORS 
TO THE VALUE OF FARMS PER ACRE 
DOLLARS 
=ER 
CRE 
+ 30 
+ 20 
+ 10 
n - 
^""T 
SOIL 
HOWN 
FERT 
LITY 
ASS 
BY CROP IN 
5EX 
-10 
-UM" 
-— "■"" 
-^T^ 
30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 
CROP INDEX 
10 

10 
PROPORTION OF LEVEL LAND 
20 
40 60 
PER CENT OF TOTAL LAND AREA 
80 
100 
100 
MILES 
Fig. 10.— Holding constant the effect of all other factors, these net regression curves show how farm 
values per acre varied with each factor 
40-acre farm or $2,750 to the value of a 60-acre farm. Above $8,000 
the value of the dwelling had very little further effect on the value of 
the farm, an $8,000 dwelling adding $4,650, a $12,000 dwelling about 
$5,700, and a $16,000 dwelling about $6,000. Apparently $6,000 
was about as much as the average farmer could afford to pay for a 
house, despite the actual replacement cost of the building involved. 
The figures given in Table 41 were used as the basis for separating 
the value of the dwelling from the value of the part of the farm used 
for agricultural production. By the use of this table it was possible 
