Let’s say you want to make clay bunnies with more and more details like hair etc. You’ll need to work on the clay and bake it in the oven. However, you find out, most clay doesn’t work for the fine details like hair and it all melts/becomes a mess. You figure out you need different clay and work really hard on it and try all the settings of your oven. Eventually you even have to build your own oven to get the best clay bunny in world.
All that experimenting with clay and ovens can be considered R&D and it can cost a lot of money because you end up with a lot of ugly/failed bunnies and one perfect bunny. After that, making the perfect bunny becomes easy because you know what clay, how much water and you have the perfect oven allowing for mass production of bunnies at lower cost.
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