Based on the given sentences above, the verbs that best agree with the subjects are INCLUDE and SHED, respectively. Notice that the subjects these verbs are referring to, the subjects are in their plural form. Therefore, we also take the plural form of the verb. Hope this answers your question.
farmers started producing excess in the 20's and people couldn't buy the product fast enough witch led to less jobs because nobody could buy the product therefore less money and then less jobs avalible.