The primary sources provided first hand evidence of an object, person or event. Historical and legal documents, accounts, eyewitnesses, pieces of creative writing, audio and video recording, etc are primary sources. These are documents that are created during the event. It enables the researcher to get as close as possible to the historical event or the period under study. The canceled US Treasury check for the purchase of Alaska is a primary document.
Alaska was purchase by US from Russia on 1st August 1867 for 7,200,000 Dollars.
Answer: I think the essential problem that money solves is something known as a lack of a double coincidence of wants. A coincidence of wants is when two people meet and they both have what the other person wants.
