  Reducing wealth inequality and disparity is a global challenge. The economic
system is mainly divided into (1) gift and reciprocity, (2) power and
redistribution, (3) market exchange, and (4) mutual aid without reciprocal
obligations. The current inequality stems from a capitalist economy consisting
of (2) and (3). To sublimate (1), which is the human economy, to (4), the
concept of a "mixbiotic society" has been proposed in the philosophical realm.
This is a society in which free and diverse individuals, "I," mix with each
other, recognize their respective "fundamental incapability" and sublimate them
into "WE" solidarity. The economy in this society must have moral
responsibility as a coadventurer and consideration for vulnerability to risk.
Therefore, I focus on two factors of mind perception: moral responsibility and
risk vulnerability, and propose a novel model of wealth distribution following
an econophysical approach. Specifically, I developed a joint-venture model, a
redistribution model in the joint-venture model, and a "WE economy" model. A
simulation comparison of a combination of the joint ventures and redistribution
with the WE economies reveals that WE economies are effective in reducing
inequality and resilient in normalizing wealth distribution as advantages, and
susceptible to free riders as disadvantages. However, this disadvantage can be
compensated for by fostering consensus and fellowship, and by complementing it
with joint ventures. This study essentially presents the effectiveness of moral
responsibility, the complementarity between the WE economy and the joint
economy, and the direction of the economy toward reducing inequality. Future
challenges are to develop the WE economy model based on real economic analysis
and psychology, as well as to promote WE economy fieldwork for worker coops and
platform cooperatives to realize a desirable mixbiotic society.
