A lot of iconic companies in the tech sector like HP, Cisco and Blackberry have been struggling recently.

This week on Money Talking, regular contributors Joe Nocera of the New York Times and Rana Foroohar of Time magazine consider if the challenges are the result of problems at the company or external forces; are these tech companies canaries in the coal mine for an impending stock market correction. Then a look ahead to a Supreme Court and a case involving Halliburton and how sanctions being lifted in Iran could affect that country's economy.