When a broker has mixed shares of his own and shares bought for customers in a common block of shares, does the customer have an equitable right to the number bought on his account?

Even where a broker has mixed shares of his own and shares bought for customers in a common block of shares, the customer has an equitable right to a number equivalent to the number bought on his account. Thus in Carter v. Long & Bisby (1896) 1896 CanLII 18 (SCC), 26 S.C.R. 430, the headnote, in part, reads as follows: If an agent is entrusted by his principal with money to buy goods the money will be considered trust funds in his hands and the principal has the same interest in the goods when bought as he had in the funds producing it. If the goods so bought are mixed with those of the agent the principal has an equitable title to a quantity to be taken from the mass equivalent to the portion of the money advanced which has been used in the purchase, as well as to the unexpended balance.