The novel of this type you mentioned is very common in online literature, and it is usually classified as rebirth or crossing type. The protagonist uses his own understanding of the future to start a business at a very young age, thus changing the fate of himself and his family. However, due to the large number of such novels, it is difficult to determine which one you are talking about without more specific information.

If you can provide more details, such as the unique events in the novel, the names of the main characters, specific plots or other unique signs, it may be easier to find the exact novel. Otherwise, I suggest that you can search for keywords such as "rebirth", "post-80 s" and "doing business" on the online novel platform or related novel forums, and you may find similar stories.

In addition, the following are some well-known rebirth business novels, you can see if they are what you are looking for:

1. The official road to rebirth

2. The Rebirth of Rolling Financial Resources

3. Reborn business empire

4. Reborn economic tycoon

In a word, these books may not completely conform to your description, but they all belong to the theme of doing business after rebirth. If you can provide more information, I will try my best to help you find the book.