Investment synergies

It seems like most of us are familiar with the H3 highway being synergistic with investment in agnland and the L1 working with Lorren. Are there other synergies as well?

I just crashed my economy by going almost full capitalism. I went L1 > Lorren > conriat industrial > electronics industry (with pumped up education) I ended up with the buff saying my investment strategy wasn't consistent though.