Insider trading is defined as "the illegal practice of trading on the stock exchange to one's own advantage through having access to confidential information" and is illegal pretty much everywhere to make stock markets more fair.
Are there similar restrictions for the trading of land or other property assets?
For example, lets say I own a railway company and want to build a station in a sparsely populated, imaginary county called Notrainsville. If I buy a lot of land in Notrainsville super cheap, announce my plans to build a station and start construction, and then sell it for a much higher price (cuz the station makes it worth more money). Is this illegal?
Another example: Lets say I'm friends with Elon Musk and in casual conversation, he mentions that he found an asteroid with $5 trillion worth of diamonds, which he plans to mine. Of course, this would hugely deflate the value of diamonds so I sell all the diamonds that I own for investment purposes immediately. Is this illegal?