; (ii) withdraw all assets from any account managed by such exempt commodity trading advisor; (iii) purchase any new shares of participation in such exempt commodity pool; or (iv) contribute additional assets to any account managed by such exempt commodity trading advisor. 123. Government Accountability Office study on aluminum markets (a) Study The Comptroller General of the United States shall conduct a study of— (1) the aluminum markets in the United States and globally, in general; (2) the effectiveness and efficiency of the markets for purchasers of aluminum; (3) what factors and policies influence the supply, demand, and movement of aluminum around the world