For us farming, and the country life, is a lifestyle so we are just starting to progress the process of more reciprocal economics.
But we use the $2 rule as a base bottom line/starting point (for now). Theory: nothing gets sold for less than $2. Meat no less than $2 a pound; eating eggs $2 a doz.; day old mixed breed chicks $2 each. Best guess on sex started chicks $4 ea.; plants...hmmmm...
Time is a lifestyle factor to us. The value of an hour in the chicken coup with my Girls (and guys) or the pasture with The Ladies (and guys) far exceeds that of a $300.00 an hour therapist, and watching chicks hatch from eggs you've been talking to for 21 days (not why I need the therapy

) is better to me than the spendiest night out. No $50 a month gym memberships here--exercise equiptment: shovels, pitchforks, bags and bales. But, true, the better the return the more time I get to LIVE this life so progress toward profit is part of the program.
But for now it's more about things paying for themselves. If we get our initial investments back--kritter costs, feed, electricity, etc.--and get safe, healthy meat, eggs, dairy products when we're milking,and produce we're happy. And that's working for us.
Can't really speak about the price of a layer...none of ours are ever for sale unless we're culling.
We sell adult birds for $5 each live. Layers/breeders=priceless, especially if mother-raised.