June 12 (Bloomberg) -- John Mauldin, president of Millennium Wave Advisors, says the state of the euro-zone economy is uncertain. Joe Saluzzi, co-head of equity trading at Themis Trading LLC, joins Mauldin to discuss his new book "Broken Markets: How High Frequency Trading and Predatory Practices on Wall Street Are Destroying Investor Confidence and Your Portfolio." Mauldin and Saluzzi speak with Bloomberg's Carol Massar and Michael McKee on "Bloomberg On the Economy." (Source: Bloomberg)