public LinkedList<Stock> getStrongestStocks(int quantity){
	LinkedList<Stock> sorted = qs.qsort(stocks, 2); // sort by percentChange
	LinkedList<Stock> ret = new LinkedList<Stock>();

	if (quantity > sorted.size())
	    quantity = sorted.size();

	for (int i = sorted.size() - 1; i >= sorted.size() - quantity; i--){
	    ret.add(sorted.get(i));
	}
	return ret;
    }