Voluntary exchange is the only way one can obtain wealth in a free market.
In the labour market, as in other factor markets, there is a tendency for every worker to receive the full marginal value of his product. It follows from this that differences in income cannot be unjust as they are based on voluntary exchange. That a successful rock 'n' roll singer, for example, should receive 100 times the average wage simply means that consumers value his services more highly than they value the services of the average producer. Therefore, the likes of Tanner have no moral authority to determine what someone's income should be or how much wealth they should be allowed to accumulate. Tanner parrots the silly socialist fallacy of treating the economy as if it were a kind of lucky dip or a national lottery.