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The market tumbles from Monday's all-time closing high - now 2% below it. What's the opposite of lighting the blue touch paper? Tech proves a defensive sector today as traditional "value" based stocks turn turtle. For a moment. Today we talk about the Budget (quickly), the CBA update (OK not dazzling) and some astonishing theory on what BHP and the other iron ore stocks would be worth if you used spot iron ore prices in your assumptions instead of current 'conservative' assumptions most of which have been in place since the iron ore price was below $100 per ton.  Now $229 per ton. BHP would be worth 225% more says Macquarie.