I'm not much of an economist so is this good or bad?
Depends who you ask. Some pundits say the sell-off is fueled by political turmoil and lingering security concerns after a failed bomb plot earlier this month.
Others say investors are bailing on the stock market because Greek sovereign debt is quite strong and severely oversold.
I've also heard a few conspiracy theories flying around that this is a tactic to prevent Greece from breaking free of the economic tutelage of the major EU powers. If surging treasury-bond yields prevent internal refinancing, Greece can't really break free of external financing from the EU or IMF.