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exchanges

<< ---------------------------------------------------------------- >> https://www.youtube.com/watch?v=dGYfpO3WJ1o&list=PLjTveVh7FakJOoY6GPZGWHHl4shhDT8iV&index=28 reqs

  1. create an exchange to match buyers and sellers of stock
  2. provide an ordered list of all operations that everybody can agree on eventually
  3. provide an ordered list of all activities pertaining to each client(placed orders, cancelled orders, trades) back to each client