Have a monopoly on (something) phrase
To have or possess something that no one else has.
The United States used to have a monopoly on atomic bombs.
He acted as if he had a monopoly on strength.
Gazprom, the world’s largest natural gas producer, has a monopoly on Russia’s network of pipelines to Europe.
This phrase is usually used in simple present tense.
This phrase was formed based on the meaning of the noun "monopoly".
People tend to like forbidden or illegal things just because they are forbidden or illegal.
He must have believed that stolen fruit is the sweetest, and he, therefore, cheated on his partner.