a “straight sale” offer is designed to close the sale and persuade the reader make a buying decision solely from the piece they’re reading at that moment. This might be a letter, a newspaper ad, an email… even a postcard. It’s designed to induce the reader to act immediately on what they read and make a purchase from you.
Two-step marketing is a prospecting system where you break the sales process into two or more parts. It’s often the best system to use when the prospect needs to be educated before they will purchase, when you sell expensive or high risk products (investing, advertising, cosmetic surgery), or when it’s important for them to try out your product or service before buying.