Generally, the price goes down because the sellers are done selling and the buyers are done buying at the higher price. Supply has outstripped demand.
By the way, "oem" stands for "original equipment manufacturer", and is used to describe the manufacturer of parts (automobile, aircraft, etc.) that were manufactured by their company and then marketed by another different company.
What you are probably wanting to put at the end of your messages is "eom", or "end of message".
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