Would a major wealth redistribution cause a major inflation? I've seen a video on wealth distribution on the US where perceived, "desired"(by the majority) and actual income distributions are shown. I've been thinking what would happen to the purchasing power if such a distribution was attained. How much could the supply increase to balance the huge amounts of money that were just being invested and accumulated and will now be spent on consumer goods? If an inflation would occur, is it possible to estimate it?
Inflation is only inflation if supply can't keep up, and if the money supply increases without growing the economy.

Massive wealth distribution (edit: on a long time scale) would be a huge boost to the economy. Why? All the purchases of consumer goods will increase production of all those goods, which will move through the entire economy causing expansion. Of course there will likely be some inflationary effects but as long as the wealth distribution didn't happen overnight whatever mechanism of distribution is probably going to redistribute slower than what the economy can handle anyway.

If you wanted to estimate potential inflationary effects you'd have to figure out the stickiness of production schedules of a basket of consumer goods that the poor would be likely to buy compared to the speed of redistribution.

Also, it's worth pointing out that a lot of money in equity is 'virtual money'. It doesn't actually exist (or rather, it exists, as long as you don't use too much of it at once). What I mean is, if for example Bill Gates wanted to liquidate half his stock, he would sell the stock at a massive loss to the current market rate and would get a lot less than you would think. The same applies to sales of any equity or land... In theory those assets have the value on paper but you can't just redistribute that form of wealth, it would end up destroying the paper wealth since the buyers wouldn't be able to afford it, and would require the seller to sell at a 'loss'... Forced distribution on a short timescale of large amounts of wealth would result in that wealth being destroyed without any real advantage, because the wealth isn't in actual money. So you could also argue that there would be some deflationary effects due to wealth distribution too!