# Cultural evolution with uncertain provision of learning resources

## TL;DR

This paper explores how uncertainty in learning resources affects the balance between individual and social learning in a population.

## Contribution

The novel contribution is showing that uncertain resource provision can make social learning beneficial for population fitness.

## Key findings

- Uncertain resource provision can turn social learning into a fitness improvement for the population.
- Equilibrium shifts to include more individual learners when resources are uncertain.
- Relaxing the assumption of guaranteed resources changes evolutionary outcomes.

## Abstract

An essential feature of human progress is the use of different modes of learning so agents acquire the appropriate behaviour to survive in a changing environment. Learning may result from agents who discover new knowledge on their own (individual learning), or imitate the behaviour of others (social learning). Social learning is less costly than discovery, but imitation might yield no benefit. Early theoretical models of a population consisting of purely individual and purely social learners found that both types are present in an evolutionary equilibrium. However, the presence of social learners did not provide any improvement to the average population fitness. Subsequent research showed that the presence of social learners could improve the average population fitness, provided that the pure characterisation of the agents’ learning is relaxed. We return to the pure conceptualisation of agents to challenge an assumption in the early work: agents were guaranteed enough resources to perform their desired learning. We show that, if the resources an agent receives are uncertain, this turns social learning into a source of fitness improvement at the population level. Perhaps counter-intuitively, uncertain provision of resources prompts an increase in the proportion of the population that pursues the costlier individual learning activity in equilibrium.