type: cross-section
frequency: 1
startobs: 1
endobs: 30

p: price of premium truffles, $ per ounce
q: quantity of truffles traded in a market period, in ounces
ps: price of choice truffles (a substitute), $ per ounce
di: per capita disposable income, in units of $1000 per month
pf: hourly rental price of truffle pig, $ per hour
