Needs to be done? According to whom? The pilotburo? 'The Economy' is simply the effort of every individual to satisfy his wants and needs. History has demonstrated the most efficient way this can take place is under freedom, where one's right to liberty and property are undisturbed. It 'sustains' itself every time someone is dissatisfied with their current conditions enough to act.
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Right. Including trade with communist/socialist nations using slave labor. Wow, are you a winner. Restate the statement under freedom, where one's right to liberty and property are undisturbed and state it more accurately as, " under MY freedom, where MY right to liberty and property are undisturbed AND SCREW EVERYBODY ELSE's.