How Many Studies Do You Need?

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Social Media Marketing Activities and Brand Loyalty: A Meta-Analysis Examination (2021, background): “When conducting a meta-analysis, some researchers claim that if there are only two studies and equal, statistically significant effects in the same direction, perhaps the intervention is operative (Cooper, 2003; Valentine et al., 2010).”
Preferred reporting items for systematic reviews and meta‐analyses in ecology and evolutionary biology: a PRISMA extension (2021, background): “…any combination of too few available studies, small sample sizes within studies, or high amounts of variability between study effects, and therefore justification of meta-regression models should include consideration of sample sizes (Item 20) and heterogeneity (Item 22) (Valentine et al., 2010).”
The Extended Transportation-Imagery Model: A Meta-Analysis of the Antecedents and Consequences of Consumers' Narrative Transportation (2014, neutral): “This number is insufficient to provide meaningful insight into the extent to which a factor may have an influence (Valentine, Pigott, and Rothstein 2010); therefore, our model does not include medium.”