but to your question, you'd just "measure" price as the prevailing price that you see in the marketplace, and labor is measured as the aggregate cost of all labor inputs, including parts and raw materials and amortized capital costs. in a well-functioning market, you'd expect prices to trend with the labor value. the industry profit percentage would then be an reasonable expression of the riskiness of the market/industry (in drug discovery, it might be 50% but in grocery, it might be 5%).

so for example, if apple sells iphones for $1000 but it costs them $400 in labor to make and sell, their labor-price markup would be 250%. in a functioning competitive market, you'd expect a competitor like samsung to pursue those profits and, as a result, eventually drive prices down.