There will be less output available in 15 to 20 years when our relatively few grandchildren - who will produce that output - will have to share it with our many retired baby - boomer children 再过15至20年，我们的孙子辈长大了，他们人口本来就少，生产这些产品的产能有限，而婴儿潮时代人的儿子辈数量众多，且都多已退休，那时候就会出现我们的孙子辈和儿子辈争产品的局面。
