Indians may have known and wanted specific trade goods, but that overlooks something important. Traders were frequently licensed, or paid employees of a company holding a royal or governmental charter. The Hudson Bay Company often set specific "values", usually in terms of type and number of furs for items the traders had. Btw, the traders were usually locked into purchasing from the parent company, and "free trading" was discouraged by means of corporate competition practices against small concerns. A trader might think of buying from another source, but that came at the risk of being frozen out from every doing business with the former supplier(s).
Part of a traders inventory of "skills" was giving his potential clients, free gifts/samples to "grease the skids" before engaged actual business. One of the "gifts" was often rum or whiskey, and the result more than once, an intoxicated Amerindian not thinking clearly and finding out he "traded" his furs for a jug, then waking up the next morning with little to show for "shrewd" trading.
Amerindians became heavily dependant on trade goods, they needed and could not make themselves. The traders could and did fix prices, and offered items their clients were told to "take or leave."
Before the nay-sayers raise objections, between 1945-1990, the Soviets treated Eastern European states along the lines of mercantile colonies forcing client states to accept Russian made goods in exchange for whatever their countries could offer in exchange. Eastern Europeans knew they were being saddled with second rate goods (east German Trabants, Czech Skoda, and cheap models of Russian Volgas etc) and there was little they could do if they wanted certain items, and were forced to take it or leave it. They KNEW they wanted better and were being denied access to those goods, and decided something was better than nothing. This "story" may not be exactly the same, but the similarities are there.
Try to remember early American was a multi-national, multi-racial hodge-podge. Try to get past the Anglo-Saxon emphasis. The Swedes and Dutch were squeezed out by the French, Spanish and English. In turn the survivors engaged in different business/trade and settlement patterns in the New World, aimed at eliminating the competitors and dominating the interior of the continent, the indigenous populations, and the fur trade.
In short, knives, tools and other items made and sold by the English, French, Dutch and Spanish were not identical.