Several thousand people are marching in Hong Kong against traders from mainland China in what is fast becoming a summer of unrest in the semi-autonomous Chinese territory.

Saturday's march passed by temporarily shuttered pharmacies and cosmetic shops that are popular with Chinese tourists and traders who bring goods back to sell in the mainland.

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Huge demonstrations in the past month against a proposal to change extradition laws are reawakening other movements in the city. Thousands marched last weekend against middle-aged mainland women who sing and dance somewhat provocatively in a public park, receiving tips from older men.

The protests have a common refrain: Hong Kong's government is not addressing citizen concerns.

The city's leader, Carrie Lam, has pledged to listen to the people, but many protesters want her to resign.