Original sentence: " As an example of this, Smith advocated a progressive tax upon modes of transportation, writing: "When the toll upon carriages of luxury, upon coaches, post-chaises, &c.corporate tax evasion), while envy is rarely if ever the motivation for large-scale crime
Edited sentence: " "In proportion to their respective abilities," it should be clear to anyone who cares to understand Adam Smith, means a flat tax, not a progressive tax.As an example of this, Smith advocated a progressive tax upon modes of transportation, writing: "When the toll upon carriages of luxury, upon coaches, post-chaises, &c.corporate tax evasion), while envy is rarely if ever the motivation for large-scale crime, although it is, of course, the motivation for all small-scale crime..