code: def get_epoch_price_multiplier( block_height, namespace_id, units ):
      
      try:
          assert units in [TOKEN_TYPE_STACKS, 'BTC'], 'Unknown units {}'.format(units)
      except AssertionError as ae:
          log.exception(ae)
          log.error("FATAL: No such units {}".format(units))
          os.abort()
  
      multiplier = 'PRICE_MULTIPLIER' if units == 'BTC' else 'PRICE_MULTIPLIER_STACKS'
  
      epoch_config = get_epoch_config( block_height )
      m = None
  
      if epoch_config['namespaces'].has_key(namespace_id):
          m = epoch_config['namespaces'][namespace_id][multiplier]
      else:
          m = epoch_config['namespaces']['*'][multiplier]
  
      try:
          assert m is not None
      except AssertionError as ae:
          log.exception(ae)
          log.error("FATAL: Tried to get a price multiplier in an epoch without price multipliers!")
          os.abort()
  
      return m
docs: what's the name price multiplier for this epoch?
      Not all epochs have one---if this epoch has BLOCKSTACK_INT_DIVISION set, use
      get_epoch_price_divisor() instead.