The portfolio will be actively managed with exposure to various asset classes, both domestic and internationally, being varied to reflect changing economic and market circumstances in order to maximise returns for investors. The Manager may also invest in listed and unlisted financial instruments as allowed by the Act from time to time. The Manager may also invest in participatory interests or any other form of participation in portfolios of collective investment schemes or other similar collective investment schemes as the Act may allow from time to time, and which are consistent with the portfolio's investment policy. Where the aforementioned schemes are operated in territories other than South Africa, participatory interest or any other form of participation in portfolios of these schemes will be included in the portfolio only where the regulatory environment is, to the satisfaction of the manager and the Trustee, of sufficient standard to provide investor protection at least equal to that in South Africa. For the purpose of this portfolio, the Manager shall reserve the right to close the portfolio to new investors on a date determined by the Manager. This will be done in order to be able to manage the portfolio in accordance with its mandate. The Manager may, once a portfolio has been closed, open that portfolio again to new investors on a date determined by the Manager. The Trustee shall ensure that the investment policy set out in the preceding clauses are adhered to; provided that nothing contained in this clause shall preclude the Manager from varying the proportions of securities in terms of changing economic factors or market conditions or from retaining cash in the portfolio and/or placing cash on deposit.