It would be great if the word (economic) cycle only existed in a singular form, and the only cycle we had in the economy was happy expansion.

FORBES: Chinese Quest For Shortcut To Greatness

Use a singular verb form after nobody, someone, everybody, neither, everyone, each and either.

FORBES: Magazine Article

And if it has not, the knowledge that both this group and one in Mexico are close to finding the genes which give the new form of maize its singular advantage should certainly do so.

ECONOMIST: Genetic engineering