for the metaphor of the chocolate cake , a wise investor would do their profit producing homework and realize that the big brother here has a tendency towards mischief and thus , as the younger sibling , decide not to take a chance on failure and thus wisely avoid getting any peanut butter on his or her hand and empty promises of cake that wont be provided , so to speak , while making sure that any chocolate cake they eat comes from a more trustworthy source such as their mom .