i need the link for the video. To answer your questions\
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A stock exchange occurs in a centralized location, think Wall Street and the Stock Market. An over-the-counter market does not. Over-the-counter markets are considered less formal compared to exchanges. OTCs are less transparent and operate on fewer rules than exchanges. This can be both good and bad for those involved.
Answer:
they perform man's job in the steel industry like the oilmines above ground , carpenter unloading docks , the clock around the calender etc .
