Such interpretation of technological change brings Dosi to identify a limited influence of market signals on the "direction" of technological change. More precisely, in his view relative prices might affect the direction of technological change only "within" the boundaries defined by the nature of the technological paradigm. Such idea can be better understood by analyzing the effect of market signals in their two possible directions: moving "downstream" (i.e. from the technology to the sale of goods) and "upstream" (i.e. from the market environment to the technology).