Sometimes it is not just one person who has an idea. In many cases, a partnership or a group of people think of an idea and then need to apply for a patent to ensure that no one tries to copy it. However, the agreement of who owns what share of that patent is often an issue for contention.
A patent is a form of property. Just because you cannot physically see or touch an idea does not mean it does not exist, or that it does not belong to someone. When more than one person works on an idea, that idea belongs to all of those who worked on it, no matter who contributed what part of that idea as you can see from https://www.natureworldnews.com/articles/43137/20200108/why-inventhelp-is-a-great-resource-for-new-inventors.htm.
When more than one person holds the patent of an idea, both of those parties have the right to market and sell the idea. So in essence if more than one person holds a patent, they all have the right to make money from it. However, if someone does more work on the idea than the others, and they have a written agreement signifying this, then that person may be entitled to more money than the others, and this is often documented in the patent.
Every country has its own rules when it comes to patents, so it is a good idea to read up as much as you can about patents and about what holding a joint patent means to you. In this way, you can draw up written agreements between partners that will determine how the patent will be split. For more details visit https://www.latinpost.com/articles/143207/20200108/why-new-inventors-need-assistance-from-inventhelp.htm.
In many cases, parties will argue that a partnership should be split half half. But what happens when one person does more work than the other, or has been instrumental in building the invention or idea? Is it fair to assume that the profits should be equally divided if one person comes up with the idea in a day, and the other spends weeks developing a product? This is all determined by the written agreement and the patent law of the country that the inventors live in.