A Googling of "Judge John Roberts economics" turns up little real, his paper trail is thin. Here are the useful Scotus links. The very smart Juan Non-Volokh likes him. He is a member of The Federalist Society. The Washington Post reports:
On the D.C. Circuit, Roberts voted with two colleagues to uphold the arrest and detention of a 12-year-old girl for eating french fries on a Metro train, though his opinion noted, "No one is very happy about the events that led to this litigation." In another case, Roberts wrote a dissenting opinion that suggested Congress might lack the constitutional power to regulate the treatment of a certain species of wildlife.
And Tradesports.com nailed it one hour in advance, read more here.