Would you give 50% of the ownership of your idea-stage startup to someone who can build it entirely

Would need to actually asset their value for the long term, quality & speed of progress, etc.

Ideas are dime and dozen. Making and building the product is not even the hardest part either, the real battles are in the launching, iterating, and marketing. If you are going to have a long term relationship with the builder, 50 sounds right, if not, no for both parties.

If they can build it entirely, and I need to spend no time on the business - absolutely. I am saving myself years of hard work, struggle and pain lol. Plus, it allows me to work on the next big thing.

Idea is not enough to achieve anything... Yeah it's important to think and find a solution about problem. However, if idea owners would not take an action about solution, dream won't come true. There is a difference between being entrepreneur and wantrepreneur :)

I think it really depends on the level of expertise that you bring. If someone is able to build it but you have overall commercial skillsets to help bring it to life than I think are entitled to more equity.

No..

For sure! At the idea stage, there's little progress / no execution that's been done. At the end of the day, it's all about execution. Especially if it's a tech startup, a builder will be the most important role

I am not sure if 50% is the right number. However, I want to call out one thing - The bottleneck in startups is always on execution, never on ideas. Hence someone actually executing the right way adds tremendous value. Next line is brutal prioritization when you have more ideas than you can execute.

It's depends on the person. Assuming they can "build it entirely", the right person would: 💗 Be passionate about the problem being solved. 👓 Resonate with the current vision and brings their own perspective. 🙌 Understand and value the Business Development efforts of the other no-technical founder(s).

This is not about percentage. It is about how much dedicated your cofounder would be to work on your startup with you. Do not split equity based on what a person brings on table, but rather split equity according to on how much equity when you give them then they would be willing to commit their time and energy into your startup. 100% of nothing is nothing. Best equity split is 50-50. Even if other cofounder brings less value to the table than you. See this video by ycombinator