Sorry to disappoint, I'm not Madus, but perhaps I can help you out.
Inflation is where the value of goods increases in relation to a unit of currency. It's not about a single product, but about the average of a wide range of products. For example, here in Britain, you used to be able to buy a loaf of bread for about 10 pence, now a loaf costs about 10 times as much. This is what we call inflation, because goods are more expensive. Deflation is much less common, but is just the opposite.
Occasionally people talk about currency inflation or deflation, which is the same as the above, but with currency. So where the bread has gained value, the currency has lost value. Before 10 pence bought you a loaf of bread, now 10 pence buys perhaps a couple of slices. Therefore, the currency has lost value. We mainly talk about this in relation to other currencies, but I won't go into that.
Ultimately, this is all caused by supply and demand. If more people want it (the demand increases), the price goes up. If more people are selling it (the supply increases), the price goes down.
To relate it to the current situation, Tyler821 is proposing that we increase the supply of regals to decrease their value. If the regal loses value, (so you can't buy a loaf with £1, you have to spend £1.10) this causes inflation. This means that the price of goods goes up, and although this might seem bad, it's really not! You don't want a high rate of inflation, because then all hell breaks loose, but a little bit of inflation means that people want to sell stuff and people will buy stuff, because if they hold on to their money, it can't buy as much. (For example, if I'd been saving £100 since 1950, back then I could've bought 1,000 loaves of bread, but now, because bread costs 10 times more, I can only buy 100 loaves.) If there's anything you need clearing up, just ask! I'm trying to learn all of this myself.
EDIT: I'll just quickly point out that these threads never result in anything, as the MassiveCraft economy isn't any real problem, but we're simply all debate junkies. Junkies or optimists.