I went down to the river and filled the jug. There is plenty more good water for you - so you go and get it yourself. The value stems from the effort put into transforming part of an abundance in to something more specific and valuable. Damming or diverting a river for entirely my own purposes to the detriment of those downstream - is a different matter however. The Locke requirement is abundance and taking without depriving others.
Resources are exhaustible.
Competition over them is evident. We pass Lisa's bucket to Locke. The cases range from nationalisation to the Common Fisheries policy of the EU and on to worker rights. For Mackie, the labour theory of property rights side-steps the scarce resources problem. Equally values may also fall in a market.