Subject of a verb in sentence and two examples

Suppose you need to verify how correctly use commas you open ur english textbook and scan the chaper titles in which one would most likey find the information you need

Which secondary effect of advertisement happens when a customer is satisfied by a product and buys it for a second time?

What is the significance of the above statement in relation to the play’s conclusion? oedipus treats his inferiors poorly but ultimately grants them the same respect he grants to nobility. while teiresias appears to be mocking oedipus, the real message is one of warning about the forces working against the king. oedipus earns great fame for answering the riddle of the sphinx but ultimately loses his crown to a common man. just as oedipus is unable to conceive that he has done wrong in the past, he is unable to imagine that his enviable position is impermanent.