Final answer:
Horticultural groups practice extensive horticulture, generating a modest surplus that supports their communities while often integrating other strategies like gathering and hunting.
Step-by-step explanation:
Horticultural groups engage in a type of subsistence economy known as extensive horticulture. This form of plant cultivation involves manual labor and simple tools to grow crops, which typically generates enough resources to support the extended-family households and produces a modest surplus that might be saved or traded in local markets. Unlike intensive agriculture, horticultural societies like the Kayapo often combine plant cultivation with other food procurement strategies such as gathering, hunting, and pastoralism, which contribute to their flexible and sustainable livelihoods.