Do you know which marketing tactics are generating the best results – leads, conversions, or sales – at the lowest cost?

The lowest cost might seem to be E-marketing, but that is not always the case.
You need to always know your target audience and the best way to reach out to them For example, if you are working in a campaign for a product that targets older people (60+), you wont waste your time on just twitter and facebook.
You will find the medium that they use most and embrace it.
Therefore, the lowest cost marketing tactic is a successful one that is based on proper research and clear objectives.

Well, let me first thank you for asking me this beautiful question :) OK, let us see what we have here "which marketing tactics are generating the best results – leads, conversions, or sales – at the lowest cost?" the very first moment I saw the question it made remember one nice story I have read, let me share it with you all now "In the year 2010 , however, one of those little gems of an idea managed to survive.
It came out of Kraft, the mega multinational food company that owns the iconic Australian brand Vegemite.
Now, Vegemite is more than just a cultural icon; it is, in fact, part of Australian culture.
It's a salty, yeasty spread that you have to be Australian to love.
The question is: how can you address falling sales in a brand that fails to translate beyond a fairly limited market? You change its name! From Sydney to Perth, the hue and cry that ensued when Vegemite suggested the change was deafening.
Which brings me back to courage.
This was the moment when Kraft showed courage and got the nation to reclaim their beloved Vegemite.
Needless to say, the name remained the same" What I want to say is, tactics may vary from a case to another for sure, as per what, whom, and where, BUT whether it is an E-marketing one as our friend Ghina Said said, or another, it is all about how you can convey your message, how you can make people talk about it, may be a simple nice newspaper ad do it, or an active dynamic account on twitter or Facebook, or catchy content newsletter.
All may fit according to your audience nature and objectives; Your main homework is to find the right SPARK for your message!

Long story short, talking generic there is no such thing, and if exists; then all people shall be using it and nothing else, and there will be no need for marketing professionals :) Each and every tactic addresses a different business case, timing, goal, situation.

SOSTAC is a planning model, originally developed in the 1990s to help with marketing planning by PR Smith, who is co-author on Emarketing Excellence.
SOSTAC® stands for: Situation – where are we now? Objectives – where do we want to be? Strategy – how do we get there? Tactics – how exactly do we get there? Action – what is our plan? Control – did we get there? Control and Metrics (Monitoring and measuring.
You can’t learn and manage if you can’t or don’t measure) use these guidelines when working with customers and partners to develop marketing automation strategies and integrated social media plans and marketing campaigns.
The beauty of SOSTAC is flexibility and adaptability.
Use SOSTAC to plan an event.
SOSTAC is perfect for planning a 3 year marketing automation and social CRM strategy.
SOSTAC works beautifully for business planning for the upcoming year.
Yes, this may seem like Marketing 101.
But it is mazing how even the largest companies get into planning chaos because they don’t have a simple method to follow.
With all of the “guru’s” and “experts” floating around promoting the latest tool or fad, especially in social media, take a fully planned approach.
SOSTAC keeps you on the right track.
The lowest cost is E-Marketing

Thank you for your adequate response I think that in addition to the previously mentioned about marketing methods must be pointed out means associated with marketing and helping to achieve the previously stated .Do not sell the benefits only ..
Do not tell the buyer about the benefits that accrue from buying the product, but only mentioned including if not buy the product.
Most buyers are afraid of loss more than they will reap the benefits, the chance of their desire will increase if I told them including if not buy the product or service Developed your offers without reducing your prices ..
It is not necessary to reduce the price of your product to develop your shows, but you can add something to the product and have this thing has a high value when the buyer.
For example, you may find in cooperative societies or the supermarket product, along with other product free like a coffee and her cup Take advantage of your customers ..
Your customers may know well and trust in you as a result of their dealings with you, and those easy to get them to work than those who did not deal with you never before.
Take advantage of this by the order of special offers for existing customers and advertising for your products / services new to them before anyone else.
Also be sure to turn your customers for marketers and promoters to you via the implementation of the policy stimulus return them benefits in return for all to tell acquaintances and friends about your products / services.
This marketing policy is less expensive than others.