Think of other examples where collective provision of goods and services is cheaper than individual provision.
One prominent example is security. It is much cheaper to have collective security for an entire locality than for each individual house to hire its own private security staff.
Similarly, healthcare and education function better through collective provision. Money cannot protect an individual from infectious diseases unless the whole community takes preventive steps together. Education is accessible to many because the government provides schools collectively, rather than parents having to afford private schools individually. Finally, a pollution-free environment is a collective good that money cannot buy; it requires collective effort to maintain.
Explanation
The textbook context explicitly contrasts collective security with individual security to illustrate cost-effectiveness. It further argues that individual money cannot buy protection from infectious diseases (requiring community action) or a pollution-free environment. It also highlights that education is possible for the masses due to collective government provision based on shared demand, rather than individual affordability.