An argument based on speculative physiology is just that, speculation. Solarpunk is a subset of the Cyberpunk speculative fiction genre. Eventually, this speculative bubble proved unsustainable. A number of cyberpunk derivatives have become recognized as distinct subgenres in speculative fiction. Many songs honor specific works in science fiction, fantasy, or speculative fiction. Stamp duty has the effect of discouraging speculative purchases of assets by decreasing liquidity. There was a concurrent increase in representation of homosexuality within non-literary forms of speculative fiction. Prediction markets may also be subject to speculative bubbles. The Christiania residents claimed them to be purely speculative accusations. An alternative suggestion is to engage in highly speculative bets with a limited downside. Green describes the book as a work of speculative fiction. The novel has since come to be recognized as a masterpiece of Japanese speculative fiction. Nuclear warfare and weapons are staple elements of speculative fiction. She was primarily known for her works of speculative fiction. Both are well-known figures in the fields of speculative fiction.