In Hong Kong, this comprises families with an income of US$20,000–40,000 per year.
Per capita income is typically around US$10,000 per year in Hong Kong, so this places them far above the average family in the territory.
However, given very high real estate prices, it is nowhere near enough for them to afford a private residence.
Hence, they are "sandwiched" between the large population who truly need public assistance, and the smaller number of people who can afford private residences and other luxury goods.
Typical issues range from unable to upgrade to private property, inability to enjoy a lifestyle or the means to support such a lifestyle, taking care of parents and children and inability to retire early.