Workers' incomes have not risen much over the past decade. Many students benefit from several years' work after high school. The Jameses' talents are extraordinary. Add 's only to the last word to form the possessive case of compound words or word groups. The council president's speech was a bore.
Taxes are always somebody else's fault.
When two or more words show individual possession, add 's to them all. If they show joint possession, add 's to the last word. Youngman's and Mason's comedy techniques are similar. The child recovered despite her mother and father's neglect. Don't mistakenly add an apostrophe to form the plural.