Using political power, the elite can induce local authorities to facilitate enclosure and privatisation of land, water, and other hitherto public amenities. And they can pressurise public administrations to cut taxes, reducing financial resources for maintaining the remaining commons.
Think of a public library, worth more for those who cannot afford numerous books. Think of a public waterway or fishing ground. All types of commons have imputed monetary value that together comprise a source of social income. As such, the commons reduces economic inequality and insecurity in society.