When I add money to a motif, how is it distributed to the stocks/ETFs I already own?
Money is distributed proportionally among all your stocks/ETFs based on your current allocation. Since security prices are constantly changing, so are the dollar weights of the motif you own. The dollar weights of the stocks/ETFs at the time of new purchase will be the same as the dollar weights of the stocks/ETFs you own at that moment. This is to ensure that adding or removing money from a motif will not alter its performance trajectory in percentage terms.