This paper examines the existing literature on tourist expenditure in microeconometric and parametric studies (TEMPS) from 2013 to 2022. We employ a Systematic Literature Review to identify articles in the field. The last review regarding TEMPS by Brida and Scuderi (2013) is updated in this paper. This fills this gap of ten-year state-of-the-art analysis in the literature. Diverse methodologies have been utilised to investigate tourist expenditure, each characterised by varying degrees of complexity. This review aims also to shed light on the factors influencing the complexity of methodologies employed in TEMPS. After the article selection, a database was constructed to compile information and outcomes from the papers and the publishing journal. An econometric model was developed to analyse specific facets of the identified literature. Findings indicate that external factors unrelated to the paper positively influence the complexity methodology, while internal factors within the paper exhibit a negative impact.