A 15yr mortgage is the only example of an acceptable debt.
And yet starting a business, which requires the purchase of similar space, is not.
Are you sure it's acceptable debt because it's economically sound or because it's the one you can't avoid?
Over the life of the mortgage the land will not depreciate in value.
False. Anything can depreciate in value. Ex.
You buy land in a town that is planning on putting in a sewer system. 2 years later the plan is scrapped. Your land just dropped in value. True story, happened to my parents.
Or you have farmland that, over time, becomes exhausted and isn't able to grow food anymore.
Or some ecological disaster due to the building of a factory nearby/disaster at factory nearby.
Land goes down in price too.
The same could not be said about any other object.
Collectables generally go up in value, provided that they are kept in good condition.
Resources go up in value since humans suck as conservation. (see oil)
Gold goes up in value all the time.
Your health is always valuable and only goes up in value as your age increases and your ability to cope with health problems decreases.
Any thing else should be purchased with cash.
Does that include medical care? Do you pay the full hospital bill of say... Your child's birth with cash up front?