How would you legally define "speculation?" How could you prove it is different from normal investment? Do you think anyone would buy the debt of a nation tha

How would you legally define "speculation?" How could you prove it is different from normal investment? Do you think anyone would buy the debt of a nation that threatened to throw you in jail if you did so in a way they didn't like? What would prevent such a government from jailing its debtors simply to get out of a situation such as what is happening in Europe?