(
A) Estimated fixed cost as a function of county income. The solid blue line displays fixed cost in the healthy food sector,
KH(
y), and the dashed black line displays fixed cost in the other food sector,
KU(
y). (
B) Share of the price due to fixed cost, in percent, as a function of individual income and computed as
/
Pz,ij, with
z ∈ {
H,
U}.