The Gaza Strip is not a very big place. The area of the Gaza Strip is about 139 square miles. This includes a significant amount of farmland and desert open space. It is about twice as wide and twice as long as Manhattan and is similarly densely populated. It is smaller geographically than most U.S. counties; it is smaller than four U.S. survey townships.
As of October 6, 2023, there were about 2.3 million Gazans. Just under half of Gazans are children (the median age there is 19 years old). This is more than 16,500 people per square mile including land that had no residents six months ago, which is a very high level of urban density.
Virtually all of Gaza's ordinary businesses have been interrupted. The vast majority of adults in Gaza are unemployed, or at least not employed in the work that they were employed in six months ago. Gaza has gone six months with essentially no external trade except meager aid shipments. The inventory of a large share of its wholesale and retail businesses has been ruined.
Most Gazans are internally displaced and those who aren't are swamped with displaced people living in tents (or less) all around them. It has no local sources of fuel, and vastly insufficient sources of local food or water to support 2.3 million people.
Gaza's few major roads need major work to be passable for civilian vehicles, and they are littered with burnt out and destroyed vehicles. Most vehicles that aren't destroyed right now aren't functional because they have no fuel.
Gaza City, where most Gazans lived six months ago, is mostly rubble. Hundred of thousands of apartments, many of the hospitals, a large share of all municipal offices, thousands of retail stores and office buildings, countless legitimate utility tunnels (in addition to its illicit Hamas tunnels designed to support military actions), the electrical grid, its telecommunications networks, many water mains, and more have been destroyed.
At this point, for most of Gaza City, the only safe option is to demolish what is left and start over from scratch. This doesn't happen over night. It would take many years to rebuild all of what has been destroyed in the last six months, even with peace and unlimited financing. And, rebuilding Gaza would be a high risk, low return investment opportunity (in a place also rife with corruption) for any private investor.
Given all that has happened in the last six months, how many people could Gaza provide a home to, in remotely tolerable conditions, with perhaps six months of rebuilding, if the fighting stopped tomorrow, some form of local government administration tolerable to Israel and the Gazans was put in place, and significant international reconstruction aid was provided?
How much would that cost?