Part of the confusion is that many people completely miss the fact that there is a close connection between cheap energy supply of the exact type needed (for example, gasoline for cars, diesel for trucks, electricity for many factory applications) and the ability of the world economy to make goods and services.
If the price of energy of the type a particular manufacturer or service provider uses increases (say gasoline or diesel or natural gas or electricity), that manufacturer or service provider in the short term has no choice but to pay the increased price, because there is no substitute for energy of the right type. If the manufacturer or service provider tries to pass these higher costs on to its customers, there is likely to be a cutback in demand, leading to a need for layoffs. Alternatively, with longer lead time, the company may be able to find a way around the problem of increased costs, by using more automation, or by outsourcing production to a country where costs are cheaper. Any of these responses leads to reduced US employment and recessionary impacts.
What History Says about Prior Collapses
Until fossil fuels came into widespread use, civilizations regularly grew until they reached limits of some sort, and then collapsed. There are many books looking at this issue. David Montgomery, in Dirt: The Erosion of Civilizations talks about the role soil erosion and soil degradation play in bringing civilizations down. Sing Chew, in The Recurring Dark Ages, talks about how ecological stress, deforestation, and climate change have led to long periods of collapse and low economic activity. Joseph Tainter, in The Collapse of Complex Societies, talks about how increasingly complex solutions to the problems of the day lead to ever-higher administrative costs that eventually become too expensive to afford.