The objective of this study is to evaluate the impact of selected macroeconomic variables on public expenditure in the UAE during the 1975-2020 period, based on the Wagner (1883) law of increasing state activities. The study employs several estimation techniques including the Gregory-Hansen cointegration approach, Autoregressive Distributed Lag (ARDL) bounds testing technique, the Canonical Cointegrating Regression (CCR), Fully Modified Ordinary Least Squares (FMOLS) estimators, the Non-linear ARDL (NARDL) method, and the Toda-Yamamoto causality procedure. The results of the cointegration tests demonstrate the presence of a long-term relationship between public expenditure and the selected variables. Further, the results of the different estimation techniques illustrate that oil price, tax burden, fiscal deficit, outward flow of money and FDI, and interest rate influence the level of public expenditure significantly both in the short-term and the long-term. Moreover, adoptin.....

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