Isoquants are normally joined with isocost lines to tackle an expense minimization issue for given degree of result. In the common case displayed in the top figure, with easily bended isoquants, a firm with fixed unit expenses of the information sources will have isocost bends that are direct and descending slanted; any mark of intersection between an isoquant and an isocost bend addresses the expense limiting information mix for creating the result level related with that isoquant. A line joining juncture points of isoquants and isocosts (with input costs held steady) is known as the extension path.[10]