Time: I do not consider time to be a force of nature. You can't manipulate it (slow it down or speed it up. nether travel forward or backward through it). There is no temporal particle, or is it a forth dimension. However I do believe time exist as a "concept". For example I can use time in a mathematical formula to predict what moment two trains leaving different stations traveling towards each other at different speeds will intersect each other (giving nothing perfect, I can predict better then random chance). If time is not a concept, then how can I predict the future (where two trains intersect) with better then random chances?
Just as Economics is not a force of nature. That is: there is no particle (photon, graviton) that holds the force of economics, or is it a 4th dimension of matter. But it is a "concept". You can use an economic model to predict the future better then random chance.
I forgot to add this part onto my last e-mail,