Since the 1980s, decline in wage share and increase in dividends or profits has become a global tendency, denoting significant changes in the functional income distributions between capital and labour. Employing macro-level analysis, some empirical studies reveal that such changes are caused by institutional changes, such as financialisation, that have occurred in the recent decades; however, few studies conduct micro-level analysis on functional income distributions. One of the aspects that would explain the recent changes in financial income distributions is the workers' and investors' perceptions of distributive justice. This can be examined by determining the respective 'fair' shares of workers and investors, who contribute to the production processes in different ways. In this paper, we perform economic experiments in laboratory involving the investment, production, and distribution stages and examined the fairness ideals in functional income distributions. All participants are pair-matched to form two-player teams, each comprising a worker and an investor. Once the investor completes the investment stage and the worker completes the production stage, each of them is required to present a proposal to divide the team earnings. The experiment comprises two treatments: (a) with-labour treatment, in which investors are required to work to earn investment funds and (b) without-labour treatment, in which investment funds are given to investors as endowments. Each participant's distribution proposal is classified under three fairness ideals-selfish (take-all), income-based egalitarian, and radical egalitarian-and we examined the factors significant for the participants' distributive justice perceptions. While an income-based egalitarian shares only the team earnings, a radical egalitarian shares not only the team earnings but also the rest of investment funds. Our findings are threefold: First, the labour theory of property seems to have a significant impact on the fairness ideals of the working participants: in the with-investor's labour treatment, both investors and workers tend to be egalitarian, whereas in the without-investor's labour treatment, workers tend to be selfish. Second, in the with-labour treatment, investors have significant tendencies to commit to income-based egalitarian proposals, whereas workers have significant tendencies to adhere to radical egalitarian proposals. These tendencies may arise from the self-serving bias maintained by both workers and investors. Third, in the without-labour treatment, both selfish investors and radical egalitarian investors increase. The increase in selfish investors can be explained by the lack of their labour experience resulting in low capability of valuing others' labour processes. Implications of our findings are twofold: First, the difference between income-based egalitarian and radical egalitarian distributions does not seem significant for finding a compromise-the worker and the investor to agree upon equal fair share; however, when investors' capital is not based on their own labour, the discrepancy between the distribution of workers and investors seems to be large. Second, our experimental results partly explain recent declines in labour wage rates through institutional changes. Financialisation tends to increase foreign and individual shareholders' ratios instead of that of domestic financial and non-financial corporations. As the former investors have less labour experience than the latter, they tend to adhere to more selfish distributions. Thus, from the micro-economic viewpoint, we understand that financialisation contributes to decreasing wage share.
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