Using assumption 5 as a starting point, and Marx’s theoretical base, the production price for hydrocarbon products and their market price are defined as:

	With:
		eq(2)

where:

pp:	production price in deposit j.
	sum of different costs i in the production process for deposit j.

These are defined as:

(eq. 3)

Where:

c ^j_exp: exploration costs for deposit j

c ^j_ext: extraction costs for deposit j

c ^j_dev: development costs for deposit j

: normal profit margin

P: market price for the product

pp ^mg: price of production in marginal deposit

: sum of different costs i in the production process for marginal deposits

pp ^j: price of production in deposit j

q ^j: production in deposit j

q ^j/ Q: relative contribution of each deposit

pp ^ME: average price of production equal to average cost

RD ^j: differential rent between deposit j and marginal deposit

RD: total rent differential