Genesis 2:10–14 has a clue that can be used to estimate the size of Eden. It is a description of the rivers flowing from Eden. It describes that the river watered the Garden of Eden first, and it was separated from there into four headwaters and surrounded the lands of the earth.
The first is the Pishon, which winds through the entire land of Havilah. The second is the Gihon, which winds through the entire land of Cush. The third is the Tigris, which runs along the east side of Asshur. The last is the Euphrates. From those verses, we learn that Eden is huge enough to surround the continents and make the rivers of the earth.
From Genesis 2:15–16, we can derive three economic concepts.
First, God said that He took Adam and put him in the Garden of Eden. It means that the first human being was not born in the Garden of Eden but was placed there by the entire sovereignty of the Lord. Also, He gave the man work there and allowed him to eat all the fruits except those from the Tree of Knowledge of Good and Evil.
It means that the real owner is the Lord, and humans can enjoy all things under His permission, not as a master but as a manager.