Spouses view the future through different lenses.
He anticipates consequences and weighs them against how alterations necessary to his life will likely keep him satisfied with himself. Example: His car is wearing out. Nurse it a while longer? New car? Used one? Upsize it? Downsize it? Save on operating costs? Dip into savings? After balancing those inter-connections and -dependencies, he makes a decision that keeps him satisfied with himself that may or may not please his wife. If he is pushed to decide or disagreement ensues, he senses greater pressure to do it his way.
OTOH, she plans improvements, manages spousal interests, and anticipates consequences so that she, they, or their children gain some advantage. His car-buying plan becomes part of the new future she anticipates. If she can, she prefers to do it her way, more closely follow her own plans, and will usually argue even furiously to get her way.
If she can’t get her way but is convinced she’s right, she tries harder, learns to resent his resistance, or —if she’s smart enough—solicits his collaboration to work together. Example: Her car is wearing out. She long ago planted a seed with husband as to her preference; whether to drive a new one, a particular model, or to take cost consciousness to a new level to help promote other plans for their future together. Her sense of cooperation drives their decisions into collaboration and easier agreement for both sides. (It’s not in his nature to initiate cooperation or collaboration; it’s mostly up to her.)
In both cases, each spouse begins simple decision-making thoughts about the first to ID the issue being first with the solution. It’s normal, natural, and far too easily the beginning of competition and dispute resolution through argument to see who gets their way.
Because they view through different lenses, neither spouse is validated as being right and thereby the best decision maker. However, different lenses promote female adroitness, more cooperation, and more often end with collaboration, aka both sides pleased with the results.