Final answer:
The burden of proof that the plaintiffs sustained a loss under the Securities Act of 1933 must be proved by the plaintiffs themselves.
Step-by-step explanation:
The burden of proof that the plaintiffs sustained a loss under the Securities Act of 1933 must be proved by the plaintiffs themselves.
Under this act, the burden of proof is typically on the party bringing the lawsuit, which in this case is the plaintiffs. They are required to provide evidence and establish that they suffered a loss as a result of the actions or omissions of the party being sued.
For example, if the plaintiffs allege that they purchased securities based on false or misleading information provided by a company, they would need to prove that they suffered financial losses as a direct result of their reliance on that false or misleading information.