We study a family of models of tax evasion, where a flat-rate tax finances only the provision of public goods, neglectingudaudits and wage differences. We focus on the comparison of two modeling approaches. The first is based on optimizingudagents, who are endowed with social preferences, their utility being the sum of private consumption and moral utility. The second approach involves agents acting according to simple heuristics. We find that while we encounter theudtraditionally shaped Laffer-curve in the optimizing model, the heuristics models exhibit (linearly) increasing Laffercurves. This difference is related to a peculiar type of behavior emerging within the heuristics based approach: audnumber of agents lurk in a moral state of limbo, alternating between altruism and selfishness.
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