the model of isolation had a huge effect apon japan because the only way they new was most likely the old fashion way. so then when they finally made contact with the rest of the world they had a whole new life.They all have always had to fend for themselves. so say if there was a war japan would not know at all. if the rest of the world made a conclusion or found a cure for a sickness that could have been affecting the Japanese they would not know. then when they had contact they had no idea of how to trade. then these other country's had realized and then they took advantage of japan. japan didn't know any better either. then later on they realized this and had over time adapted to these changes.