code: def adjust(self, amount, update=True, flow=True, fee=0.0):
          
          # adjust capital
          self._capital += amount
          self._last_fee += fee
  
          # if flow - increment net_flows - this will not affect
          # performance. Commissions and other fees are not flows since
          # they have a performance impact
          if flow:
              self._net_flows += amount
  
          if update:
              # indicates that data is now stale and must
              # be updated before access
              self.root.stale = True
docs: Adjust capital - used to inject capital to a Strategy. This injection
          of capital will have no effect on the children.
  
          Args:
              * amount (float): Amount to adjust by.
              * update (bool): Force update?
              * flow (bool): Is this adjustment a flow? A flow will not have an
                  impact on the performance (price index). Example of flows are
                  simply capital injections (say a monthly contribution to a
                  portfolio). This should not be reflected in the returns. A
                  non-flow (flow=False) does impact performance. A good example
                  of this is a commission, or a dividend.