... the total cash position of the investor at any point in time, is πt− θtXt− ψtYtwhich explains the particular form of the SDE (8). Similarly to equation (6), the solution to the ... expressing the fact that the investor stops trading after time D.14in Y , the total wealth held in X and Y is always zero. The entire wealth of the investor is continuously invested in the collapsing ... being that the total cash position in (10), appears to be equal to the total wealth πtat anypoint in time. In fact, equation (10) is the SDE governing the wealth processof an investor, following...