1The media's speculation about the company's financial troubles led to a sharp decline in its stock price.
2Is it fair to say that the rise in housing prices is largely driven by speculation rather than genuine demand?
3The government has introduced measures to curb speculation in the foreign exchange market and stabilize the currency.
4Avoid engaging in speculation about the cause of the accident until the official investigation is complete.
5The philosopher's work is characterized by a mix of rigorous argumentation and informed speculation about the nature of reality.